A wire of 3 ohm resistance and 10 cm length is stretched to 30 cm length. Assuming that it has uniform cross sectional, what be its new resistance?

A wire of 3 ohm resistance and 10 cm length is stretched to 30 cm leng

1.	A wire of 3 ohm resistance and 10 cm length is stretched to 30 cm length. Assuming that it has uniform cross sectional, what be its new resistance?
Answer» $r = p \times <klux>L</klux> \div a$ Where r is RESISTANCE p(rho) is SPECIFIC resistance and a is area of cross-section. SINCE r is directly proportional to l, we can SAY new resistance will also be thrice since length has become thrice r= 3 ohm x 3 = 9 ohms

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A wire of 3 ohm resistance and 10 cm length is stretched to 30 cm length. Assuming that it has uniform cross sectional, what be its new resistance?

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