Question 372: Current Electricity

Question

The actual value of resistance R, shown in the figure is 30$$\Omega $$. This is measuered in an experiment as shown
using the standard formula R = $${V \over {\rm I}}$$, 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 -

Accepted Answer

0.95 R = $${{R{R_v}} \over {R + {R_v}}}$$
0.95 $$ 	imes $$ 30 = 0.05 R
v
R
v
= 19 $$ 	imes $$ 30 = 570 $$\Omega $$

Answer

570 $$\Omega $$

Answer

600 $$\Omega $$

Answer

350 $$\Omega $$

Answer

35 $$\Omega $$

Current Electricity

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