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  4. For the circuit showing, all wires have same resistance and equivalent resistance between points A and B is R. Now, if the keys are closed, then the equivalent resistance becomes (x R/3). Find x.

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Q. For the circuit showing, all wires have same resistance and equivalent resistance between points $A$ and $B$ is $R$. Now, if the keys are closed, then the equivalent resistance becomes $\frac{x R}{3}$. Find $x$.Physics Question Image

Current Electricity

Solution:

Correct answer is '7'

Solution Image