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One of the circuits for the measurement of resistance by potentiometer is shown. The galvanometer is connected at point `A` and zero deflection is observed is observed at length `PJ = 30 cm`. In second case the secondary cell is changed. Take `E_(s) = 10 V` and `r = 1 Omega` in `1^(st)` reading and `E_(s) = 5 V` and `r = 2 Omega` in `2^(nd)` reading. In second case, the zero deflection is observed at length `PJ = 10 cm`. What is the resistance `R` (in ohm)?A. `1 Omega`B. `2 Omega`C. `3 Omega`D. `4 Omega` |
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Answer» Correct Answer - A (a) When there is no current through galvanometer, current throuhg `R` is `I = (E_(S))/(R + r)` Potential difference `= IR = (E_(S) R)/(R + r)` Now `(E_(S) R)/(R + r) = K l` For first case, `(10 R)/(R + 1) = K (30)` Divide (i) and (ii) to get `R = 10 Omega` |
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