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In a portion of a circuit, an ammeter reads 5 A while a voltmeter of resistance 480 ohm, connected in parallel with a resistor R, reads 96 V. The ammeter measures the total current entering the parallel combination. Find R.

20 ohm
24 ohm
32 ohm
16 ohm

Correct answer: 20 ohm

Solution

The voltmeter draws 0.2 A, so R carries 4.8 A at 96 V, giving R = 96/4.8 = 20 ohm.

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