Question

50 ohm and 100 ohm resistors are connected in series. this connection with a battery of 2.4 . when a voltmeter of 100 ohm resistance is connected across 100 ohm resistors then the reading of the voltmeter will be?

Answer 1

r1 = 50 ohm

r2 = 100 ohm

Voltmeter connected in parallel to r2

Voltmeter resistance Rv = 100 ohm

So  parallel resistance = Rp

1/Rp= 1/r2 + 1/Rv

1/Rp = 1/100 + 1/100

Rp = 50 ohm

Rn - net resistance

r1 + Rp = 50 + 50 = 100 ohm

net current = 2.4/100 = 0.024 A

Voltmeter reading = net current * Rp = 0.024*50 = 1.2 V  

Voltmeter reading = 1.2V

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