Question

If the reading of voltmeter connected in the circuit is 10 V. The resistance of voltmeter is (A) Zero (B) infinite (C) 6 Ω (D) 3 Ω

Answer 1

Answer:

6 ohm

Explanation:

i have explained everything in the the image. i hope it helps :)

(i messed up the voltage spelling at a place)

Answer 2

Answer:

The correct option is C) 6 Ω

Explanation:

Given,

Resistance in Voltmeter = x

$\frac{1}{R}$ = $\frac{1}{x}$ + $\frac{1}{3}$ = $\frac{3 + x}{3x}$

Now, Voltage at rest in the connection

50 - 10 = 40V

So, 40V = I × 8Ω

∴ I = 40/8

I = 5 A

Now, 10V = 5A × $\frac{3x}{3+x}$

30 + 10x = 15x

5x = 30

x = 30/5

x = 6Ω

Hence, the resistance of voltmeter is 6 Ω.

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