The reading of the voltmeter is :- .......... | vedclass

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Question

(C) First, calculate the equivalent resistance of the parallel combination of the $300 \, \Omega$ resistor and the $600 \, \Omega$ voltmeter:$R_p = \f

Vedclass · Accepted Answer

$40$

Vedclass · Answer

(C) First, calculate the equivalent resistance of the parallel combination of the $300 \, \Omega$ resistor and the $600 \, \Omega$ voltmeter:$R_p = \frac{300 	imes 600}{300 + 600} = \frac{180000}{900} = 200 \, \Omega$The total equivalent resistance of the circuit is:$R_{eq} = 200 \, \Omega + R_p + 100 \, \Omega = 200 + 200 + 100 = 500 \, \Omega$The total current in the circuit is:$I = \frac{V}{R_{eq}} = \frac{100}{500} = 0.2 \, A$The voltage across the parallel combination (which is the reading of the voltmeter) is:$V_{voltmeter} = I 	imes R_p = 0.2 	imes 200 = 40 \, V$

The reading of the voltmeter is :- .............. $V$

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