Current Electricity and Electrical InstrumentHard

Question

If the reading of ammeter is 2A then the reading of voltmeter

Options

A.Depends on R

B.Independent on R

C.Zero for certain value of R

D.can′t be determined

Solution

V_P - V_Q = 2(2R) ⇒ 4R = 24 - (2R)I₁
⇒ I₁R = 12 - 2E, E - I₂(4R) = 4R, I₁ + I₂ = 2
⇒ E = 20R - 48

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