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in Physics by (44.7k points)

Consider the potentiometer circuit shown. The potentiometer wire is 600 cm long and having resistance 15r. At what distance from the point A should the jockey touch the wire to get zero deflection in the galvanometer ? 

(A) 450 cm 

(B) 320 cm 

(C) 420 cm 

(D) 360 cm

1 Answer

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Best answer

The correct option is  (B) 320 cm.

Explanation:

Let jockey divider 600cm length into two parts as shown

Let the jockey be placed at a distance y cm from the left. 

∴ [y / (600 – y)] = [(15 – x) / x] = [(15 – 7) / 7] = (8/7) 

∴ 7y = 4800 – 8y 

∴ 15y = 4800 

y = 320 cm 

∴ distance is 320 cm from point A.

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