Question

A wire of 25 ohm is stretched to elongate by 20 % of its initial length. Its resistance will increase by

Answer 1

Answer:

The resistance will increase by 20%, because resistance is proportional to the length of the wire in the circuit.

Answer 2

Answer: Resistance will increase by 20%

Explanation:

• Given original resistance=25 ohm
• The wire is elongated by 20% of its initial length.
• New length= 25+20% of 25

                            = $25+\frac{20}{100}*25$

                           = 25 + 5

                           = 30 ohm

• Increase in resistance=5 ohm
• % increase= $\frac{5}{25}*100$

                           = 20%

• Hence, the required increase in resistance is 20%.

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