In the circuit shown in figure reading of voltmeter is V1 when only S1 is closed, reading of voltmeter is V2 when only S2 is closed and reading of voltmeter is V3 when both S1 and S2 are closed. Then

(1) V3 > V2 > V1

(2) V2 > V1 > V3

(3) V3 > V1 > V2

(4) V1 > V2 > V3

Concept Questions :-

Combination of resistors
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Current through wire XY of circuit shown is :

(1) 1 A

(2) 4 A

(3) 2 A

(4) 3 A

Concept Questions :-

Combination of resistors
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12 cells each having same emf are connected in series with some cells wrongly connected. The arrangement is connected in series with an ammeter and two cells which are in series. Current is 3 A when cells and battery aid each other and is 2 A when cells and battery oppose each other. The number of cells wrongly connected is

(1) 4

(2) 1

(3) 3

(4) 2

Concept Questions :-

Grouping of cells
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Following figure shows cross-sections through three long conductors of the same length and material, with square cross-section of edge lengths as shown. Conductor B will fit snugly within conductor A, and conductor C will fit snugly within conductor B. Relationship between their end to end resistance is

(1) RA = RB = RC

(2) RA > RB > RC

(3) RA < RB < R

(4) Information is not sufficient

Concept Questions :-

Derivation of Ohm's law
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In the following star circuit diagram (figure), the equivalent resistance between the points A and H will be

(1) 1.944 r

(2) 0.973 r

(3) 0.486 r

(4) 0.243 r

Concept Questions :-

Combination of resistors
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In the adjoining circuit diagram each resistance is of 10 Ω. The current in the arm AD will be

1. 2i5

2. 3i5

3. 4i5

4. i5

Concept Questions :-

Combination of resistors
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In the circuit of adjoining figure the current through 12 Ω resister will be

(1) 1 A

(2) 15A

(3) 25A

(4) 0 A

Concept Questions :-

Combination of resistors
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The reading of the ideal voltmeter in the adjoining diagram will be :

1. 4 V

2. 8 V

3. 12 V

4. 14 V

Concept Questions :-

Combination of resistors
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The resistance of the series combination of two resistance is S. When they are joined in parallel the total resistance is P. If S = nP, then the minimum possible value of n is :

(1) 4

(2) 3

(3) 2

(4) 1

Concept Questions :-

Combination of resistors
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Which of the adjoining graphs represents ohmic resistance :

(1)

(2)

(3)

(4)

Concept Questions :-

Derivation of Ohm's law
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Difficulty Level: