In the given circuit the internal resistance of the 18V cell is negligible. If R1 = 400 Ω, R3 = 100 Ω and R4 = 500 Ω and the reading of an ideal voltmeter across R4 is 5V, then the value of R2 will be:

Engineering

Physics

Ohm Law and Current Basics

Question

In the given circuit the internal resistance of the 18V cell is negligible. If R₁ = 400 Ω, R₃ = 100 Ω and R₄ = 500 Ω and the reading of an ideal voltmeter across R₄ is 5V, then the value of R₂ will be:

550Ω

450Ω

300Ω

230Ω

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$\frac{12}{400} = \frac{6}{600} + \frac{6}{R_{2}} a$

$\Rightarrow \frac{1}{200} = \frac{1}{600} + \frac{1}{R_{2}}$

⇒ R₂ = 300 $Ω$

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