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Home  >>  JEEMAIN and AIPMT  >>  Physics  >>  Class12  >>  Current Electricity
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For what value of $R$ will the current passing through the $4\: ohm$ resistor is zero


$\begin {array} {1 1} (A)\;1\Omega & \quad (B)\;2\Omega \\ (C)\;3\Omega & \quad (D)\;4\Omega \end {array}$


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Potential difference across the $ 4\: ohm$ resistor is zero $ \Rightarrow$ potential difference across
$2\: ohm $ resistor is $4V$ and across $R$ will $-2V$.
The current through the 2 ohm resistor is 2A.
The KVL equation for the big loop is
10 - 2i -iR - 4 = 0
On solving the $KVL$ equations, we get $ R = 1 \: ohm$.
Ans : (A)


answered Feb 10, 2014 by thanvigandhi_1
edited Sep 10, 2014 by thagee.vedartham

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