In an experiment to determine the resistance of a

D In a common base connection the emitter current is 6 28mA and collector current is 6 20 mA Determine the common base DC current gain

Illustration 27 A galvanometer has a resistance of 30 22 and a current of 2 mA is needed to give a full scale deflection What is the resistance needed and how is it to be connected to convert the galvanometer a into a ammeter of 0 3 A range b into a voltmeter of 0 2 V range

A potentiometer wire of length L and resistance 102 is connected in series with a battery of e m f 2 5V and a resistance in its primary circuit The null point corresponding to a cell of e m f IV is L obtained at a distance If the resistance in the primary circuit is doubled then the position of new 2 null point will be

7 6 Two long current ca plane as shown in the figure Magnitude of net magnetic field at centre point O is Radius of circular parts is R L 1 3 Ho 3 0 4 R Ho 4 0 k k 20 10 2 21 Ho 4 0 k 4t R 4 Zero

4 When two resistances X and Y are put in the left hand and right hand gaps in a wheatstone meter bridge the null point is at 60cm If X is shunted by a resistance equal to half of itself then find the shift in the null point a 26 7 cm b 36 7 cm c 46 7 cm d 96 7 cm

A capacitor is charged by a battery The battery is removed and another identical uncharged capacitor is connected in parallel The total electrostatic energy of resulting system NEET 2017 1 decreases by a factor of 2 times 3 increases by a factor of 2 times 2 remains the same 4 increases by a factor of 4 times or of an isolated parallel plate capacitor C having a charge Q and area A

The emitter base junction of a transistor is biased Question Type Single Correct Type 1 Reverse forward Reverse reverse biased while the collector base junction is

A three stage amplifier has a first stage voltage gain of 100 second stage voltage gain of 200 and third stage voltage gain of 400 Find the total voltage gain in dB Note answer must have decimal point upto 2 decimal e g if answer is 20 you can write it as 20 00

P In the circuit shown R R 10 0 and resistance per unit length of wire PQ 10 cm and length PQ 10 cm If R is made 200 then to get zero deflection in galvanometer S is midpoint of wire PQ R RI 12VT S Q The jockey at P can be moved towards right 3 cm The jockey at Q can be moved towards left 2 cm The jockey at S can be moved towards left a distance 5 3 cm

1 A cell a resistor a key and ammeter are arranged as shown in the circuit diagrams of Figure12 1 The current recorded in the ammeter will be R A R R www ii Fig 12 1 a maximum in i b maximum in ii c maximum in iii d the same in all the cases CK A A K iii