Current Electricity Questions and Answers

The maximum current that can be measured by a galvanometer of resistance 40 is 10 mA It is converted into voltmeter that can read upto 50 V The resistance to be connected in the series with the galvanometer is 2 Points 2010 2 4050 5040 S 4060 O

3 In the given figure the network R 2 2 and E 12 V The equivalent resistance of the above network and current through each branch of the network is a 4 2 and 2 5 A respectively e 2 2 and 6 A respectively b 2 2 and 3 A respectively d None of the above

1 A cell of emf E in the secondary circuit gives null deflection for 1 5 m length of potentiometer of wire length 10 m If another cell of emf E2 is connected in series with E then the null deflection was obtained for 2 5 m length of potentiometer Then E E2 is 1 3 5 2 2 3 3 3 2 4 5 3 RK C

32 Two sources of equal emf are connected in series to an external resistance R The internal resistances of both the sources are r and 1 such that r r If potential difference across the source having internal resistance r2 is zero then 1 RA 1 2 3 R 1 2 1 R 2 R r 1 4 R 1 1

SolveLancer Test Consider Colour Code for Carbon Resistors with bands A B C D B D Case i A Green B Violet C Orange and D Silver Case ii A Yellow B Red C Orange and D No colour The value of R and R is given by SolveLancer Test R x y and Ri P Q where x y and P Q are a 52500 10 40000 5 b 57000 10 42000 20 c 37000 5 42000 10 d 29676 10 49000 20

In a metre bridge the null point is found at a distance of 20 cm from A If a resistance of 120 is connected in parallel with resistor S the null point occurs at 25 cm from A Find the value of R and S R A V S B

Current passing through a b will be respectively 10V 1 2 3 Question Type Single Correct Type 100 1A 1A 0 0 1092 1A 0 b 100 10V

What is the equivalent resistance between A and B 1 2 A 3 Question Type Single Correct Type www W R R 3R 2 2R R www R M wwB R R

1 English In the circuit shown in the figure if the potential at point A is taken to be 2V the potential at point B is R www 1 2 3 4 2A R A 3V 3V 4V 5V 5V 2A www 292 6V 1 1 B www R 5A X Your Answer

In the circuit of the figure 1 50 kV C 6 60 F R R R3 0 870 MQ With C completely uncharged switch S is suddenly closed at t 0 At t 0 what are a current i in resistor 1 b current iz in resistor 2 and c current i3 in resistor 3 At t that is after many time constants what are d i e iz and f i3 What is the potential difference V across resistor 2 at g t 0 and h t R 48 Re ww

Resistance of a wire at any given temperature C is given by R 0 R 1 ad ao where apare positive constants and R is the temperature at 0 C The temperature coefficient of the material of wire is a Be a pe a Be a Bel 02 B 6

Two bulbs rated as 25 W 110 V and 100 W 110 V Their combination is connected to 220 V electric supply Then choose the correct option O For series combination both bulbs will work properly O For series combination first bulb will fuse For parallel combination both bulb will work properly O For parallel combination first bulb will fuse

3 28 A conducting wire of resistance 1202 at 20 C is connected in a circuit Due to current flow in it its resistance increases to 24092 Find the final temperature of wire given that temperature coefficient of resistance is 2 x 10 4 C 1 Ans 5020 C

equivalent resistance between A and B is 199286 60 Ke 2568 Ook ono dod Doen AB 50 ZAOB 45 A508050 Be 500g de 00 45 D B

Electrons flow through a 1 7 mm diameter aluminum wire at 1 9x10 m s Part A How many electrons move through a cross section of the wire each d Express your answer using two significant figures VAE

When two cells of emf E and E are connected in series the null point across potentiometer wire i obtained at 60cm When polarity one cell is reversed null point is obtained at 40cm E Hence E2 is equal to Consider E E

igure shows an L R circuit Value of current through the battery long time after closing the switch S is www R O O O 1 1x 18 V 3V 2R 2R 16 21 26 31 36 41 46 51

Hint 65 In the circuit shown the value of I in ampere is 492 www www 492 4 V 492 www www 492 1 6 92 www 1 1 2 0 6 3 0 4 4 1 5 Hint Total resistance of the middle branch is 6 22 and total current 1 A will b reverse ratio of resistors in the two branches

Find the potential difference across the capacitor in volts R R R 10V R C R

The power dissipated in an AC circuit is zero if the circuit is Question Type Single Correct Type 1 Purely resistive 2 Purely inductive only 3 Either purely inductive or purely capacitive

The ammeter reading in the following circuit will be 69 202 wwwwww 65 wwwww 692 Question Type Single Correct Type 1 1 8 A 2V 3 24 A

resistor and a length all are A 2 volt battery a 15 potentiometer of 100 cm connected in series If the resistance of potentiometer wire is 5 0 then the potential gradient of the potentiometer wire is Question Type Single Correct Type 1 0 005 V cm 2 0 05 V cm 3 0 02 V cm

In the circuit shown the switch S is closed at t 0 Then the current through the battery after steady state reached is A 2A B 4A C 6A D 8A 402 www 2 F S 402 ww www 202 5 mH moooooo 602

c Velocity 2 In the network shown each resistance is equal to R The equivalent resistance between adjacent corners A and Dis a R b R c F 0 V E C N R d R 15 A R m www A 1 boll

7 A rod of length has varying cross section as shown in figure The resistivity of material is p If potential difference across two ends is V then current through the rod is 14 1 3 a V 2p V al 2 4 2 a V pl 3 a V 2p 2a

the given circuit initial charge on the ALI capacitor is 1 5 C with polarity as shown in figure and current in the inductor is zero Now at t 0 if the key k is closed then the minimum current through the key is D C 32 3V 222 6 8V 000000Wwwwww 5H k A 33 25 A C 36 25 A 3 80 0 25F A B F HH wwwwww 20 2V B 34 25 A P none

The ammeter reading in the following circuit will be 60 www 202 wwww 602 wwww 60 www A B 1 8 LOU 2V

93 In the diagram the input is across the terminals A and C and the output is across B and D Then the output is A a zero c full wave rectifier B C D b same as the input d half wave rectifier

Question No 25 The ammeter reading in the following circuit will be 6 0 wwww 202 2V wwwww 60 O 602 wwwwww 01 A 8 0 3 A 4 2 02A

uestion No 7 This section has 7 questions Each question has FOUR options A B C and D Only ONE of Marking scheme o 3 if the correct option is selected o 1 in case if selected typed option is incorrect o 0 in case if no responses typed selected Referring to the shown circuit the current will be minimum in 212 Physics Se a

The ammeter reading in the following circuit will be 1 2 652 wwwww C 292 wwwww Question Type Single Correct Type 652 wwwww 692 8 A 2V 314 4 A

11 In a region of space suppose there exists a electric field 40x 1 The potential difference VA Vo is where Vo is the potential at the origin and VA the potential at x 2 m is 1 160 V 3 120 V 2 160 V 4 80 V

Homework Answered Four resistors are arranged as shown Calculate the electric potential difference through R Your answer should be in units of volts V Do not enter the units with your answer 2 0 4 0 5 00 7 00 www ww W R Ro R3 R4 A

8 In the network shown points A B and C have potential of 70 V zero and 10 V respectively Bov 70 V A www 100 2002 1 3 2 1 2 1 2 3 30 2 10 V The ratio of current in the section AD DB and DC are

In a common emitter amplifier output resistance is 5000 2 and input resistance is 2000 92 If peak value of signal voltage is 10 mV and 50 then the peak value of output voltage is 1 5 x 106 volt 2 2 5 x 104 volt 3 1 25 volt 4 125 volt

10 The reading of voltmeter in the figure shown is 2002 www 100 V 1 50 V 3 40 V 100 2 300 600 2 60 V 4 80 V

Find the current through 102 resistor shown in figure 1 Zero 3 2 A 392 www 4 5 V HH 102 3 V www 692 www 2 1 A 4 5 A

Test 6 Code A 4 A galvanometer has a resistance 100 2 It give full scale deflection on passing 10 mA curren through it To convert it into a voltmeter of range 0 10 V the resistance to be added in series is 1 8000 2 2 900 2 3 110 2 4 90 2

53 In the circuit shown figure if the current distribution remains unchanged on connecting E then the valu of E will be f fack 1 12 Volt 2 6 Volt 60 ww 120 892 ww 100 ww E 3 4 Volt 4 2 Volt

The following four wires are made of the same material and are at the same temperature Which one of them has highest electrical resistance 1 Length 50 cm diameter 0 5 mm 2 Length 100 cm diameter 1 mm 3 Length 200 cm diameter 2 mm 4 Length 300 cm diameter 3 mm 1 2 3 4

Employ Norton s theorem to reduce the network connected to RL to o two components b Calculate the downward directed current flow through RL if it is a 3 3k ohms resistor c Verify your answer simulating both circuits with PSpice or a comparable CAD tool 300 mA 5 kn www 7k0 1k0 25V 6kf

6 Assume the piezoceramic sensor dimensions 15mm x 35mm x 0 6mm W L T The parameters are 831 12 x 10 Vm N E 8x 10 0 N m c 11 95 x 10 9 F m Calculate a the capacitance C b the piezoelectric coefficient the axial deflection when the voltage output is 101

3 V V V 4 V V V In given circuit find the reading of voltmeter Er ET B 1 2 2 3 3e 4 0 When a current of 4 A flows within a battery from its 35 3 V V V fed fun atez A Er GR 1 2 2c fare 2 V V V 4 V V V ere ich and ET ET B 3 3 4 0 2007 for oft 4 inform

An initially uncharged capacitor C is being charged by a battery of emf E through a resistance R upto the instant when the capacitor is charged to the potential E 2 the ratio of the work done by the battery to the heat dissipated by the resistor is given by A 2 1 B 3 1 C 4 3 D 4 1 2 W x 1 GV LC E1 CE

Determine value of Vo for the elect shown in the figure Ge 10 V 1 6 6 V Si 1 22 OV 3 392 2 9 V 4 6 6 V

You are given a number of 27 resistors each capable of dissipating only 2 9 W without being destroyed What is the minimum number of such resistors that you need to combine in series or in parallel to make a 270 resistance that is capable of dissipating at east 5 0 W

Four cells and six resistances are connected as shown in the figure Then CO MAZZA 30 B 1202 www 12V 802 ww www del 3 The magnitude of current through 80 resistor connected between the points B and E is 1A The magnitude of current through 80 resistor connected between the points B and E is 1 5A The potential difference between the points B and D is 20V Potential at D is greater than that at B

ii A cell of EMF 3 4V and internal resistance 30 is connected to an ammeter having resistance 202 and to an external resistance of 10052 When a voltmeter is connected across the 10002 resistance the ammeter reading is 0 04A Find the voltage read by the voltmeter and its resistance Had the voltmeter been an ideal one what would have been its reading C 40002 3 2V 3 238V 2

Question 1 Single Select Type A battery of emf 16V and internal resistance 20is connected across a long uniform wire AB of length 1m and resistance per unit length 20m Two cells of emf 5 11 and 2 are connected as shown in the figure If the galvanometer shows no deflection at point P the distance of point P from point A is equal to 16V 213 101 00 50 cm 20 100 cm

Consider the circuit in the a What current flows from the battery b What is the potential difference between points A and 50 0 2 A ww 20 0 22 20 0 52 40 0 2 wwww ww wwww 70 0 2 20 0 52 120 V For the toolbar press ALT F10 PC or ALT FN F10 Mac Arial B 14px