In the diagram shown, the reading of voltmeter is 20 V and that of ammeter is 4 A. The value of R should be (consider given ammeter and voltmeter are not ideal) :

(1) Equal to 5 Ω

(2) Greater from 5 Ω

(3) Less than 5 Ω

(4) Greater or less than 5 Ω depends on the material of R

Concept Questions :-

Kirchoff's voltage law
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Which is a wrong statement :

(1) The Wheatstone bridge is most sensitive when all the four resistances are of the same order

(2) In a balanced Wheatstone bridge, interchanging the positions of galvanometer and cell affects the balance of the bridge

(3) Kirchhoff's first law (for currents meeting at a junction in an electric circuit) expresses the conservation of charge

(4) The rheostat can be used as a potential divider

Concept Questions :-

Wheatstone bridge
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AB is a wire of uniform resistance. The galvanometer G shows no current when the length AC = 20cm and CB = 80 cm. The resistance R is equal to 

(1) 2 Ω

(2) 8 Ω

(3) 20 Ω

(4) 40 Ω

Concept Questions :-

Meter bridge and potentiometer
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The circuit shown here is used to compare the e.m.f. of two cells E1 and E2(E1>E2). The null point is at C when the galvanometer is connected to E1. When the galvanometer is connected to E2, the null point will be 

(1) To the left of C

(2) To the right of C

(3) At C itself

(4) Nowhere on AB

Concept Questions :-

Meter bridge and potentiometer
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In the Wheatstone's bridge (shown in figure) X = Y and A > B. The direction of the current between ab will be

(1) From a to b

(2) From b to a

(3) From b to a through c

(4) From a to b through c

Concept Questions :-

Wheatstone bridge
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A resistance of 4 Ω and a wire of length 5 metres and resistance 5 Ω are joined in series and connected to a cell of e.m.f. 10 V and internal resistance 1 Ω. A parallel combination of two identical cells is balanced across 300 cm of the wire. The e.m.f. E of each cell is 

(1) 1.5 V

(2) 3.0 V

(3) 0.67 V

(4) 1.33 V

Concept Questions :-

Meter bridge and potentiometer
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Constantan wire is used in making standard resistances because of its :

(1) Specific resistance is low

(2) Density is high

(3) Temperature coefficient of resistance is negligible

(4) Melting point is high

Concept Questions :-

Derivation of Ohm's law
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A potentiometer consists of a wire of length 4 m and resistance 10 Ω. It is connected to a cell of e.m.f. 2 V. The potential difference per unit length of the wire will be :

(1) 0.5 V/m

(2) 2 V/m

(3) 5 V/m

(4) 10 V/m

Concept Questions :-

Meter bridge and potentiometer
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In the circuit shown PR, the reading of the galvanometer is same with switch S open or closed. Then 

(1) IR=IG

(2) IP=IG

(3) IQ=IG

(4) IQ=IR

Concept Questions :-

Wheatstone bridge
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In the following Wheatstone bridge P/Q=R/S. If key K is closed, then the galvanometer will show deflection :

(1) In left side

(2) In right side

(3) No deflection

(4) In either side

Concept Questions :-

Wheatstone bridge
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