• # question_answer A d. c. supply of 120V is connected to a large resistance X. A voltmeter of resistance $10\,k\Omega$ placed in series in the circuit reads 4V. What is the value of X? A)  $190\,k\Omega$                     B)  $90\,k\Omega$C)  $290\,k\Omega$                     D)  $390\,k\Omega$

Given $(10\,k\Omega )I=4V$ OR$10\,k\Omega$. $\frac{120V}{X+10k\Omega }=4V$ OR  $300k\Omega =X+10k\Omega ;$ $X=2901\,k\Omega$