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Question 23: NCERT Solutions for 12th Class Physics: Chapter 3-Current Electricity

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Question 23: NCERT Solutions for 12th Class Physics: Chapter 3-Current Electricity

Figure shows a potentiometer circuit for comparison of two resistances. The balance point with a standard resistor R = 10.0 Ω is found to be 58.3 cm, while that with the unknown resistance x is 68.5 cm. Determine the value of x. What might you do if you failed to find a balance point with the given cell of emfε?

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  1. Solution:
    For comparison of resistances, R and x should be in series and same current should flow through them.

    If we fail to find balance point with cell of e.m.f. e, in that case we should reduce the current I and for that e.m.f. E of cell responsible for current I should reduce, or a resistor can also be attached in series with R and x to reduce current.