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