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35. A copper wire is stretched l0.1% longer, the percentagechange in its resistance is(a) 02% (b) 0.1% (c) 05% (d) 04%36. A current of 3A flows through awire shown in figure. Thepotential difference betweenpoints A and Bis3 28 V6 V(a) 26.5 V(c) 58 V(b) 14.5 V37. Five resistances of10Q, 20Q, 20 Ω, 40Ω, and 50Ω areconnected as shown in figure. Theequivalent resistance betweenpoints A and Bis10Ω20Ω50220Ω40 2(a) 40 s2 (b) 60 S2 (c) 2092 (d) 30 |
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Answer» the given circuit is a wheat stone bridge as 10/20 = 20/40 so remove the middle resistance of 60Ω ( because they are in between equipotential points so, 10 and 20 are in series , adding up to 30Ω and 20 and 40 are in series , adding up to 60Ω now this 30Ω and 60Ω are in parallel... the equivalent resistance is = 30*60/(30+60) = 20Ω option C 20free |
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