Current Electricity Questions and Answers

For the circuit shown in figure value of resistance Ris adjusted such that power dissipated in resistance Ris maximum and equal to Po Value of Po is 6 V 10 3 3 V W 322 www wwww 692 wwww 292 www R

For the circuit shown in figure value of resistance R is adjusted such that power dissipated in resistance R is maximum and equal to Po Value of Po is 6 V 10 3 5 3 3 V W W 392 www www 622 www 292 wwwww R

Three resistor R R and R are connected to a battery of 12 V as shown in figure Calculate heat produced in each of three resistors in 2 minutes 2 6 3 1 R1 36122130 R 60 www www R 3 22 R 422

P 8 Current Electricity MEC Magnetis CAREER FISTITUTE 2 Resistors P Q and R in the circuit have equal resistances If 12 ff the battery is supplying a total power of 12 W what is the power dissipated as heat in resistor R 1 2 W 2 6 W 3 3 W 4 8W tik G 1 2 W 2 6 W 3 3 W 4 8 W 12 W ww 11

plz solve it for me main problem is finding series and par allel combinations so plz indicate potentials at every point and make me clear about the combinations thankyou in advance Power consumed by 3 0 resistor shown in electric circuit is 4 5V 192 www wwww 292 0 5 W 0 75 W X0 25 W 1 25 W 352 wwww 652 40 www Asked by 2288786 aesl id Standard XII Stream NEET Jul 26 2021 at 5 20 PM Add your responses Type Text Type your answer here OR you can upload an attachment from the option below

7 How many different combinations may be obtained with three resistors each having the resistance R 1 3 3 5 4 6 8 Consider the situation shown in figure If the current I in the long straight wire XY is increased at a 2 4

The resistance of a metallic conductor increases with temperature due to a change in carrier density b change in the dimensions of the conductor c increase in the number of collisions among the carriers d increase in the rate of collisions between the carriers an a the vibrating atoms of the conductor

A current carrying square loop is placed near an infinite long current carrying wire as shown in figure The torque acting on loop is 1 2 Question Type Single Correct Type 3 i 4 Hoi i2 a 4T Hoi a 2TT a Moi 2 0g2 2 a a

08 1 Resistance of a wire is 34 kf2 5 Write the order of colored rin representing i If ammeter shows a reading of 10A and voltmeter having intern the given resistanc 300K

Why 12 In a metre bridge the balance point is found to be at 39 5 cm from the left end A when the resistor R is of 12 5 2 Determine the value of S Determine the balance point of the bridge when R and S are interchanged Diagram What happens if the galvanometer and the cell are interchanged at the balance point of the bridge Would the galvanometer show any current

In the circuit shown A The equivalent resistance between the points A and B is 5 02 B The current in the 5 2 resistor is 2 3 A C The potential difference across the 6 resistor is 1 6 V P The current coming out of the battery is 2A 10V A B 492 422 302 592 20 302 392 692 692

Three identical bulbs are figure When switch S is closed the power consumed in bulb B is P What will be the power consumed by the same bulb when switch S is opened 1 2 3 9P 4 16P 9 9P 16 A B S C

e 11 12 13 14 denote current in the branches Choose the correct option R www www R www 3R E AN www 1 R 13E 2E www 2R www 4R 13 4E 14 R E O 1 12 13 14 0 1 12 13 14 O 1 13 2 14 Ohshshsh

and for L to H Across a battery write H on positive terminal and I on negative terminal Across o resistance keep in mind the fact that current always flows from higher potential H to lower potential 1 For example in the loop shown in figure we have marked H and I across all batteries and resistances Now let us apply the second law in the loop ADCBA 1 A 2V 1 H L Fig 23 25 iR E iR E 0 The equation will be Example 23 18 Find currents in different branches of the electric circuit shown in figure 4Q ww Es 4V 6V

A small charged ball is hovering in the state of equilibrium at a height h over a large horizontal uniformly charged sheet What would be the acceleration of the ball if a disc of radius r 0 001 h r h is removed from the plate directly underneath the ball O O O 9 2 2 7 2 a h me Mater PRIS

The combination shown in the diagram may be replaced by a single cell of emf and internal resistance equal to 8V 20 Aww 122 5 V 3 V 1Q 4 V 20 5 V 10 3 V 20 4 V www 222 B

38 Electric potential at a distance 10 cm from the midpoint on a perpendicular bisector of a dipole will be A 10 esu C 0 B 20 esu D None

A secondary cell after long use has an emf of 1 9 V and a large internal resistance of 38022 What maximum current can be drawn from the cell Could the cell drive the starting motor of a car a 5 mA yes c 5 mA No b 5mA Yes d 5 mA No

1 In case if selected typed opti 0 In case if no response is typed selected Two charged spheres are kept at a finite centre to centre spacing as shown in the figure The force of electrostatic interaction between them is first calculated assuming them point like charges at their respective centres and then force is measured experimentally If the calculated and the measured values are Fe and Fm respectively which of the following conclusion can you certainly draw

42 Shunt is connected in a parallel combination with a galvanometer of resistance 25092 For times of the total curre value of shunt current passes through the galvanometer becomes A 25 2 C 25 11 2 B 50 Q D 12 5 2

For the circuit shown all wires have negligible resistance the battery has a constant internal resistance of r 8 092 and the two light bulbs B and B are identical each with resistance Rbulb The variable resistor is initially set R 26 092 The switch S in the circuit now is closed To what resistance must the variable resistor be set if bulb B is to have the same brightness after the switch is closed as it did with the switch open www R Battery B 09 09 O 13 09 O 16 09 The answer can be computed only if the bulbs resistance Rhulh is known

2 22 A 30 V storage battery is charged from 120 V direct current supply mains with a resistor being connected in series with battery to limit the charging current to 15 A If all the heat produced in circuit could be made available in heating water the time it would take to bring 1 kg of water from 15 C to the 100 C is minute Neglect the internal resistance of the batteryl

37 An electron moves along the line AB which lies in the same plane as a circular loop of conducting wire as shown in the diagram What will be the direction of current induced if any in the loop A No current will be induced B The current will be clockwise all the time C The current will be anticlockwise all the time D The current will change direction as the electron pass by

All bulbs consume same power The resistance of bulb 1 is 360 3 A B C D 2 Resistance of bulb 3 is 99 resistance of bulb 4 is 40 Voltage output of the battery if the power of each bulb is 4W is 16 V None of these

A 1200 watt motor has to be operated 12 hours day How much will it cost at the rate of Rs 7 50 u in 12 days 1 Rs 1296 4 Rs 1926 2 Rs 1080 3 Rs 108

In the circuit shown in figure the switch S is closed at t 0 and it is observed that the current in R is always equal to the current in the inductor of inductance L2 Find inductance in H of inductor L2 R 492 www R 292 www R 00000 L 1 H 00000 Correct answer 2 User answer Solution Answer 2 E

A 22 65 2 alent resistance between points A and B is A B 802 2002 www B 45 2 2 292 wwww 3092 1502 www 4092 wwww C 5 2 C www 1092 laz wwww 1002 D 9 1 2 2 C AIA moned

In the figure below what is the potential difference between the point A and B and between B and C respectively in steady state 3 F A 3 F 2002 www HH 1 F 100V HE 1 f HH 1 F 1092 1 VAB VBC 100 V 2 VAB 75 V VBC 25 V 3 VAB 25 V VBC 75 V 4 VAB VBC 50 V

A car has a fresh storage battery of e m f 12V and internal resistance 2x10 02 If the starter motor draws a current of 80A Then the terminal voltage when the starter is on is 2020 a 12V c 10 4 V b 8 4 V d 9 3 V

4 cells of identical emf E internal resistance r are connected in series to a variable resistor The following graph shows the variation of terminal voltage of the combination with the current i What is the emf of each cell used ii Calculate the internal resistance of each cell O

3 The same mass of aluminium is drawn into two wires 1mm and 2 mm thick Two wires are connected in series and current is passed through them Heat produced in the wire is in the ratio 1 16 1 2 8 32 3 8 2

1 The armature of a 12 pole DC shunt generator has 50 slots with 12 conductors in each slot in wave winding arrangement The generator is running at a speed of 625 RPM and supplies a resistive load of 15 ohm at a terminal voltage of 300 volt the armature resistance is 0 5 ohm and the field resistance is 60 ohm find armature current generated EMF and flux per pole

3 When potential difference across a given copper wire is increased drift velocity of free electrons a Decreases b Increases c Remain same d Get reduced to Zero 4 Two wires of same material having radii in the ratio 1 2 carry currents in the ratio 4 1 The ratio of drift velocities of electrons in them is a 2 1 b 1 1 c 1 4 d 16 1

a battery the charge will move from one terminal to another Th O the battery is perfect O the battery in not perfect it has a built in internal resistance the electric field will be located outside of the battery O the battery has to be made out of insulating materials

questions Each question has 4 choices 1 Read More ne V l characteristics of a non ohmic device the figure Which region represents the nega sistance region J OA AB BC B C V volt

A galvanometer of resistance 1000 contains 100 division It gives a deflection of on division on passing a current of 10 A Find the resistance to be connected to it so that it becomes a voltmeter of range 10V 2 50052 3 500 1 Q 9 100 Q 4 90092

A truncated conical conductor of resistivity P length and cross sectional radii a and 2a are connected to ar ideal battery as shown The current through battery is 4a V pl 2a V pl 3 a V

An electric generator is supplying a current of 80 A to a frill of bulbs each of 50 W connected in parallel Each bulb is giving its maxi output The terminal voltage of the generator is 100 V and the internal resistance is 0 05 Q 80A 30 055 Q E m f of the generator is A 70 V B 104 V K

An electric field is applied to a semiconductor Let the number of charge carriers density is n and the average drift speed be v If the temperature is decreased TU 1 both n and v will increase 2 n will increase but v will decrease 3 v will increase but n will decrease nd

In the circuit shown above the key is pressed at time t 0 Which of the following statement s is are true 40 F 5002 2502 20 F Key 5V A The voltmeter displays 5V as soon as the key is pressed and displays 5V after a long time B The voltmeter will display OV at time t In2 seconds C The current in the ammeter becomes 1 e of the initial value after 1 second D The current in the ammotor hocomo5 zoro after a long time

11 8 Three bulbs A B and C are connected as shown in Fig below What changes occur in brightness of the bulbs when the switch is closed 4 Mark only one oval 0000 3 B brightness of A increases but that of C decreases brightness of A remains the same but that of C decreases Obrightness of both A and C decreases brightness of A increases but that of C remains the same

A charged particle having q and mass m accelerated by a potential difference Vo enters inside a parallel plate capacitor parallel to length 1 of plates at midpoint of its separation between plates at t 0 Electric field between the plates of the capacitor varies with time t as E at where a is constant Angle of deviation as it comes out of plates is 4 Value of ma 14 2qV

A small ball of mass m suspended by an insulating thread hangs at height habove a large horizontal conducting plane It performs small oscillations When a charge q is imparted to the ball the oscillation period becomes n times Then the value of q is Take n IN 3h mg 4 4he mg 3r h 3 omg

16 ohm s law is obeyed by many substance but one can t say that it s a fundamental law of nature It s a basic law regarding flow of the current which defines resistance as constant of proportionality The dependence of R was also discussed by ohm s law The potential applied across a conductor and current through it was also one of the important point discussed in this law i What will be resistance across a slab if area is doubled a Resistance will be double c No change I b Resistance will be halved d Resistance will be zero ii on what factor does the resistance depends on a Material only c Material and dimension both b Dimension of conductor only d None of these iii How does resistivity change with temperature a Increases linearly b Decreases linearly c First increases and then decrease d None of the above iv What can you say about the relation between V and I from ohm s law a V depends on I linearly b V depend on I non linearly

According to Faraday s law the current induced in a conducting loop that is moved in a uniform magnetic field is Increased Decreased Non zero constant Zero In the circuit shown in figure below the reading of ideal ammeter connected in circuit shows when switch is opened ammeter shows 2 current when switch is closed Difference between and 12 is 100 22 ww A 100 Q waris 50 22

9 6 A current i is flowing through a resistance R connected to a primary cell having some internal resistance Now R is reduced to half its value The new current flow is Mark only one oval 21 21

6 3 In the circuit shown below the resistance of R2 is decreased Then Mark only one oval 0000 ER current through R1 increases current through R1 is constant voltage drop across R2 decreases power dissipated by R2 decreases O R2 20

Find the equivalent resistance in 2 between the terminals A and B as shown on the diagran below Put R 1202 r 80 and neglect the resistance of leads R B r R r www R r www R 00

A voltage source whose open circuit voltage is V has an internal resistance r The maximum power it can deliver to an external load connected across its output terminals is A B C D V r V 2r 0 3r V 4r

what will be the magnitude of rhe voltage across the capacitor at a time 21 4 seconds after the switch is closed 50 0 V R ww Consider the circuit with R 141 k and C204 uF If the capacitor is initially uncharged what will be the magnitude of the voltage in volts across the capacitor at a time 21 4 seconds after th answer as a positive number with 1 digit right of decimal Do not enter unit