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A resistance of `4 Omega` and a wire of length 5 meters and resistance `5 Omega` are joined in series and connected to a cell of e.m.f. `10 V` and internal resistance `1 Omega`. A parallel combination of two identical cells is balanced across `300 cm` of wire. The e.m.f. `E` of each cell is A. `1.5V`B. `3.0V`C. `0.67V`D. `1.33V` |
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Answer» Correct Answer - B `E=pil=(Vl)/L=(iR)/LxxIimpliesE=E/(R+R_(h)+r) xxR/L xxl` `implies E=10/(5+4+1) xx5/5xx3=3V` |
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