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Q.

A 6Ω resistance is connected in the left gap of a meter bridge.  In the second gap 3Ω and 6Ω  are joined in parallel.   The balance point of the bridge is at ---------

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a

75 cm

b

60 cm

c

30 cm

d

25 cm

answer is A.

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Detailed Solution

Resistance R=6 Ω Resistance S=3Ω and 6 Ω Balancing condition for meter bridge            RS=l100−l         63×63+6=l100−l       300−3l=l ∴  l=75 cm
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