Question

in the given circuit the internal resistance of the 18V cell is negligible if r1=400 ohm,r3=100 ohm and r4=500 ojm and the reading of an ideal voltmeter across r4 is 5v then the value of r2 will be​

Answer 1

The resistance of R2 will be 300Ω.

Explanation:

V4 = 5V

i1 = V4 / R4 = 0.01 A

V3 = i1R3 = 1V

V3 + V4 = 6V = V2

V1 + V3 + V4 = 18 V

• V1 = 12 V

i = V1 / R1 = 0.03 Amp.

i2=0.02 Amp

• V2 = 6V

R2 = V2 / i2 = 60.02 = 300Ω

Hence the resistance of R2 will be 300Ω.

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