The lengths and cross-sectional areas of four copper wires A- B- C and D are respectively 1-2- 2 A -2 l - A -2 and 1-2- A -2- The wire which has the maximum resistance isA- DB- AC- CD- B

The correct option is D B Use the expression for resistance of a wire. ...

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Standard X

Physics

Resistance

The lengths a...

Question

The lengths and cross-sectional areas of four copper wires A, B, C and D are respectively $(\frac{l}{2}, 2 A), (2 l, \frac{A}{2})$ and $(\frac{l}{2}, \frac{A}{2})$ . The wire which has the maximum resistance is

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Solution

The correct option is B
B

Use the expression for resistance of a wire.

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The lengths and cross-sectional areas of four copper wires A, B, C and D are respectively (l2,2A),(2l,A2) and (l2,A2). The wire which has the maximum resistance is

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The correct option is B
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Use the expression for resistance of a wire.