A sensitive galvanometer has a resistance of 180 Ω and requires 2.40 μA of current to produce a full-scale deflection. The series resistance needed to construct a voltmeter that gives full-scale deflection for a potential difference of 10.0 V is approximately

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Quizplus · Accepted Answer

The correct answer is A because the series resistance needed to construct a voltmeter that gives full-scale deflection for a potential difference of 10.0 V is approximately 4.17 MΩ. This can be calculated using the formula V = IR, where V is the potential difference, I is the current, and R is the resistance. In this case, V = 10.0 V, I = 2.40 μA = 2.40 x 10^-6 A, and R = 180 Ω. Substituting these values into the formula, we get 10.0 V = (2.40 x 10^-6 A)R, which gives R = 4.17 MΩ.

A Sensitive Galvanometer Has a Resistance of 180 Ω and Requires