Question

A cylindrical wire has a radius of r and length l if both r and l are doubled the resistance of the wire

Answer 1

Resistance of wire is half

Answer 2

Question :

Fill in the blanks :

A cylindrical wire has a radius of r and length l . If both r and l are doubled, the resistance of the wire ____.

Answer :

A cylindrical wire has a radius of r and length l. If Both r and l are doubled , the resistance of the wire decreases.

• Resistance is the opposition to the flow of electricity in a circuit.
• We know that resistance of a wire is inversely proportional to the square of radius of the wire.
• Hence , when radius of the wire is doubled, the resistance decreases.

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