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Two cells `a` and `B` of emf `1.3 V` amd `1.5V `respectively are arranged as shown in figure. The voltmeter reds `1.45V`. The voltmeter is assumed to be ideal. Then A. `r_A = 2r_B`B. `r_A = 3r_B`C. `r_B= 2r_A`D. `r_B = 3r_A` |
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Answer» Correct Answer - B b. `1.45 = 1.3 + Ir_A` `1.45 = 1.5 - Ir_B` `Ir_B = 0.05` `Ir_A = 0.15` Dividing, we get `r_B/r_A = 1/3` or `r_A = 3r_B` . |
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