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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33.3 cm

66.67 cm

25 cm

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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