JEE Main 2026 Physics question
A voltmeter with internal resistance of x Ω can be used to measure upto 20 V. In order to increase its measuring range to 30 V, the required modification is to .
Answer: (A)
Solution
= 20/x. For range 30 V: 30/(x+R) = 20/x, giving R = x/2, in series.