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
O
R= 400 ohm
r=1200 ohm
r=600 ohm​

Answer 1

Answer:

r =1200 ohm

Examination

I don't know Examination

Answer 2

Answer:

Resistance R=1200 ohms

Explanation:

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

current I in circuit I=$\frac{v}{r} =\frac{20}{400} \\\\=0.05$

potential difference across R i  

{ total voltage-  voltage across 400                                            ohms resistace  (80-20)}=60 V

(since total voltage =80 V)

Resistance R=V/I

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

Resistance R=1200 ohms

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