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AP Physics C: E&M/Unit 11 – Electric Circuits
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Voltmeter Loading Effect in Parallel Circuit

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In a DC circuit, the potential difference across a parallel combination of resistors R2R_2 and R3R_3 is V0V_0. When a voltmeter with internal resistance RvR_v is connected in parallel with these resistors, what is its reading?

A

V0×Rv+R2RvV_0 \times \dfrac{R_v + R_2}{R_v}

B

V0×R2∥R3∥RvR2∥R3V_0 \times \dfrac{R_2 \parallel R_3 \parallel R_v}{R_2 \parallel R_3}

C

V0×R2Rv+R2V_0 \times \dfrac{R_2}{R_v + R_2}

D

V0×RvRv+R2∥R3V_0 \times \dfrac{R_v}{R_v + R_2\parallel R_3}

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