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Q.

A d.c. supply of 120V is connected to a large resistance $X$ . A voltmeter of resistance $10 k Ω$ placed in series in the circuit reads 4V. What is the value of $X$ ?

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a

$190 k Ω$

b

$90 k Ω$

c

$290 k Ω$

d

$390 k Ω$

answer is C.

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Detailed Solution

Question Image

$\begin{array}{l} Given, across voltmeter \\ V=IR \\ \Rightarrow 4= (\frac{120 V}{X + 10 k Ω}) (10 k Ω) \\ \Rightarrow X = 290 k Ω \end{array}$

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