The actual value of resistance R, shown in the figure is 30 Ω . This is measured in an experiment as shown using the standard formula R = (V/I) , where V and I are the readings of the voltmeter and ammeter, respectively. If the measured value of R is 5 % less, then the internal resistance of the voltmeter is :

Question

The actual value of resistance R, shown in the figure is 30 Ω . This is measured in an experiment as shown using the standard formula R = (V/I) , where V and I are the readings of the voltmeter and ammeter, respectively. If the measured value of R is 5 % less, then the internal resistance of the voltmeter is : (A) 350 Ω (B) 570 Ω (C) 35 Ω (D) 600 Ω

Tardigrade Admin · Accepted Answer

0.95 R = (RRv/R+Rv) 0.95 ×30 = 0.05 Rv Rv = 19 ×30 = 570 Ω

350 $Ω$

570 $Ω$

35 $Ω$

600 $Ω$

$0.95 R = \frac{R R _{v}}{R + R _{v}}$
$0.95 \times 30 = 0.05 R_{v}$
$R_{v} = 19 \times 30 = 570 Ω$

350 Ω

570 Ω

35 Ω

600 Ω

0.95R=R+Rv​RRv​​ 0.95×30=0.05Rv​ Rv​=19×30=570Ω

350 $Ω$

570 $Ω$

35 $Ω$

600 $Ω$

$0.95 R = \frac{R R _{v}}{R + R _{v}}$
$0.95 \times 30 = 0.05 R_{v}$
$R_{v} = 19 \times 30 = 570 Ω$