Q.

Resistances in the two gaps of a meter bridge are l0 ohm and 30 ohm, respectively. If the resistances are interchanged the balance point shifts by

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a

33.3 cm

b

66.67 cm

c

25 cm

d

50 cm

answer is D.

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Detailed Solution

S= 100−ll  . RInitially,  30 = 100−ll ×  10  ⇒  l=25  cmFinally,  10 = 100−ll ×  30  ⇒  l=75  cmSo, shift = 50 cm.
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Resistances in the two gaps of a meter bridge are l0 ohm and 30 ohm, respectively. If the resistances are interchanged the balance point shifts by