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  4. A piece of wire of resistance 4 ohm is bent through 180 at its mid point and the two halves are twisted together. Then the resistance is

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Q. A piece of wire of resistance 4 ohm is bent through 180 at its mid point and the two halves are twisted together. Then the resistance is

Current Electricity

Solution:

Length is halved. Area is doubled. Since $R = \frac{\rho \, l}{A}$ . Therefore R will become $\left( \frac{1}{4} \right)$ times.