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In the arrangement shown in figure when the switch `S_2` is open, the galvanometer shown no deflection for `l=L//2`. When the switch `S_2` is closed, the galvanometer shown no deflection for `l=5L//12`. The internal resistance `(r)` of `6V` cell, and the emf `E` of the other battery are respectively A. `3 Omega, 8 V`B. `2 Omega, 12V`C. `2Omega, 24 V`D. `3 Omega, 12 V` |
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Answer» Correct Answer - B b. When switch `S_1` is open `6/E = L/2//L= 1/2` `:. E = 12V` When switch `S_2` is closed, we get `(6xx10)/(10+r) = (5L)/(12L) E = 5/12 xx 12 = 5` `:. 10 + r = 12 or r = 2Omega` |
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