JEE MAIN - Physics (2019 - 10th January Evening Slot - No. 2)
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 -
_10th_January_Evening_Slot_en_2_1.png)
570 $$\Omega $$
600 $$\Omega $$
350 $$\Omega $$
35 $$\Omega $$
Explanation
0.95 R = $${{R{R_v}} \over {R + {R_v}}}$$
0.95 $$ \times $$ 30 = 0.05 Rv
Rv = 19 $$ \times $$ 30 = 570 $$\Omega $$
0.95 $$ \times $$ 30 = 0.05 Rv
Rv = 19 $$ \times $$ 30 = 570 $$\Omega $$
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