Question

the reading of the ideal Voltmeter connected across 400ohm resistance is 20 V then find out the value of resistance R. R= 800 ohm R= 400 ohm r=1200 ohm r=600 ohm​

Answer 1

Answer:

r=1200 ohm

Explanation:

Here, it is a closed circuit with resistors connected in series so current will be same.

Current in the circuit is v/R = 20/400 = 0.05A

potential difference across R is 60V(since total voltage is 80V)

so r = v/i = 60/0.05 = 1200 ohm

Answer 2

Answer:

1200 ohms

Explanation:

it is closed circuit connected in series

the reading of the ideal Voltmeter connected across 400ohm resistance is 20 V

current across 400 ohms resistance=

$\frac{20}{400} = 0.05amps$

potential difference across the circuit =80-20=60v

total resistance R across the circuit=

$\frac{60}{0.05} = 1200 \: ohms$

Resistance R across the circuit is 1200 ohms

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