A 100, V voltmeter of internal resistance 20, | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) The circuit consists of a voltmeter (resistance $R_v = 20\, k\Omega$) in series with a resistor $R$ connected to a $110\, V$ source.The current $i

Vedclass · Accepted Answer

$420$

Vedclass · Answer

(C) The circuit consists of a voltmeter (resistance $R_v = 20\, k\Omega$) in series with a resistor $R$ connected to a $110\, V$ source.The current $i$ flowing through the circuit is given by:$i = \frac{110}{R + 20 	imes 10^3}$The voltage across the voltmeter is given as $5\, V$. Using Ohm's law for the voltmeter:$V_v = i 	imes R_v$$5 = \left( \frac{110}{R + 20 	imes 10^3} ight) 	imes 20 	imes 10^3$Rearranging the equation:$5(R + 20 	imes 10^3) = 110 	imes 20 	imes 10^3$$5R + 100 	imes 10^3 = 2200 	imes 10^3$$5R = 2100 	imes 10^3$$R = 420 	imes 10^3\, \Omega = 420\, k\Omega$

$A$ $100\, V$ voltmeter of internal resistance $20\, k\Omega$ in series with a high resistance $R$ is connected to a $110\, V$ line. The voltmeter reads $5\, V$. The value of $R$ is ................ $k\Omega$.

Similar Questions

The figure shows a network of resistors and a battery. If $1 \ A$ current flows through the branch $CF$,then the $emf$ $E$ of the battery is ............... $V$.

Two wires of resistance $R_1$ and $R_2$ have temperature coefficients of resistance $\alpha_1$ and $\alpha_2$,respectively. These are joined in series. The effective temperature coefficient of resistance is

In the given circuit diagram,the current through the battery and the charge on the capacitor,respectively,in the steady state are:

In the given network, the potential difference between the points $B$ and $D$ is

If the ammeter in the given circuit reads $2\, A$,the resistance $R$ is ............ $\Omega$.

Vedclass Test Series

Exam Paper Generator

Online Exam Module