In the potentiometer arrangement shown in figure, null point is obtained at length ℓ . Match the following List - I List - II (P) If E 1 is increased (1) Z should increase (Q) If R is increased (2)

Question

In the potentiometer arrangement shown in figure, null point is obtained at length $ℓ$ . Match the following

List - I	List - II
(P) If $E_{1}$ is increased	(1) Z should increase
(Q) If R is increased	(2) $ℓ$ should decrease
(R) If $E_{2}$ is increased	(3) € should remain the same to again get null point
(S) If r is shunted	(4) Q becomes zero
	(5) None

TestHub · Accepted Answer

E 2 ​ = L E 1 ​ ​ × ℓ where L = length of A B (A) If E 1 ​ is increased, ℓ should be decreased keeping E 2 ​ and L constant. (B) If R is increased, current through potentiometer will decrease. Hence V A J ​ will decrease. But V A J ​ = E 2 ​ means length should be increased. (C) If E 2 ​ is increased, ℓ should be increased.

Physics - Current Electricity Question with Solution | TestHub

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