Two wires of the same dimensions but resistivities ρ1 and ρ2 are connected in series. The equivalent resistivity of the combination is

(1) ρ1 + ρ2

(2) $\frac{{\rho }_{1}+{\rho }_{2}}{2}$

(3) $\sqrt{{\rho }_{1}{\rho }_{2}}$

(4) $2\left({\rho }_{1}+{\rho }_{2}\right)$

Concept Questions :-

Combination of resistors
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A 3 volt battery with negligible internal resistance is connected in a circuit as shown in the figure. The current I, in the circuit will be

(1) 1/3 A

(2) 1 A

(3) 1.5 A

(4) 2 A

Concept Questions :-

Combination of resistors
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Find the equivalent resistance between the points a and b

(1) 2 Ω

(2) 4 Ω

(3) 8 Ω

(4) 16 Ω

Concept Questions :-

Wheatstone bridge
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The potential difference between point A & B is

(1) $\frac{20}{7}\text{\hspace{0.17em}\hspace{0.17em}}V$

(2) $\frac{40}{7}\text{\hspace{0.17em}\hspace{0.17em}}V$

(3) $\frac{10}{7}\text{\hspace{0.17em}\hspace{0.17em}}V$

(4) 0

Concept Questions :-

Wheatstone bridge
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Difficulty Level:

In the circuit shown below, The reading of the voltmeter V is

(1) 12 V

(2) 8 V

(3) 20 V

(4) 16 V

Concept Questions :-

Wheatstone bridge
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In the circuit shown in the adjoining figure, the current between B and D is zero, the unknown resistance is of

(1) 4 Ω

(2) 2 Ω

(3) 3 Ω

(4) em.f. of a cell is required to find the value of X

Concept Questions :-

Wheatstone bridge
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In the circuit shown in the figure, the current flowing in 2 Ω resistance

(1) 1.4 A

(2) 1.2 A

(3) 0.4 A

(4) 1.0 A

Concept Questions :-

Wheatstone bridge
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Five resistors are connected as shown in the diagram. The equivalent resistance between A and B is

(1) 6 ohm

(2) 9 ohm

(3) 12 ohm

(4) 15 ohm

Concept Questions :-

Wheatstone bridge
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In the figure given the value of X resistance will be, when the p.d. between B and D is zero

(1) 4 ohm

(2) 6 ohm

(3) 8 ohm

(4) 9 ohm

Concept Questions :-

Wheatstone bridge
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The effective resistance between points A and B is

(1) 10 Ω

(2) 20 Ω

(3) 40 Ω

(4) None of the above three values

Concept Questions :-

Wheatstone bridge
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Difficulty Level: