H2P-292
Internal resistance
H2 Physics · JC 2 · Hard · Internal resistance
A cell of e.m.f. 4.0 V and internal resistance 2.0 Ω is connected across a uniform wire XY of length 1.0 m and resistance 8.0 Ω. A second cell of e.m.f. 3.0 V and negligible internal resistance is connected in series with a galvanometer to a sliding contact P on XY. What length XP is required for a null deflection in the galvanometer?
- 0.94 m
- 0.80 m
- 0.75 m
- 0.64 m
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