A d.c. supply of 120V is connected to a large resistance X. A voltmeter of resistance 10kΩ placed in series in the circuit reads 4V. What is the value of X ?
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a
190kΩ
b
90kΩ
c
290kΩ
d
390kΩ
answer is C.
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Detailed Solution
Given, across voltmeter V=IR⇒4=(120 VX+10kΩ)(10kΩ)⇒X=290kΩ
A d.c. supply of 120V is connected to a large resistance X. A voltmeter of resistance 10kΩ placed in series in the circuit reads 4V. What is the value of X ?