$$30$$. The resistance of iron wire is $$10$$ Ω and α$$=5$$×$$10$$−$$3/0C$$ . If a current of $$30A$$ is flowing in it at $$200C$$ , keeping the potential difference across its length constant, if the temperature is increased to $$1200C$$ , what is the current flowing through that wire?

Question

$$30$$. The resistance of iron wire is $$10$$  Ω and α$$=5$$×$$10$$−$$3/0C$$ . If a current of $$30A$$ is flowing in it at $$200C$$ , keeping the potential  difference across  its length constant, if the temperature is increased to $$1200C$$ , what is the current flowing through that wire?

Infinity Learn · Accepted Answer

α $$=$$ $$R2$$−$$R1R1t2$$−$$R2t1or$$, $$R2$$ $$=$$ $$R11+$$αt $$(approximately)R2$$ $$=$$ $$101+5$$×$$10$$−$$3$$×$$100=$$ $$101+0.5=$$ $$15$$Ω$$i1R1$$ $$=$$ $$i2R210$$×$$30$$ $$=$$ $$i215i2$$ $$=$$ $$20A$$

30. The resistance of iron wire is $10 Ω$ and $α = 5 \times 10^{- 3} /^{0} C$ . If a current of 30A is flowing in it at $20^{0} C$ , keeping the potential difference across its length constant, if the temperature is increased to $120^{0} C$ , what is the current flowing through that wire?

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30. The resistance of iron wire is 10 Ω and α=5×10−3/0C . If a current of 30A is flowing in it at 200C , keeping the potential difference across its length constant, if the temperature is increased to 1200C , what is the current flowing through that wire?

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Ready to Test Your Skills?

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30. The resistance of iron wire is $10 Ω$ and $α = 5 \times 10^{- 3} /^{0} C$ . If a current of 30A is flowing in it at $20^{0} C$ , keeping the potential difference across its length constant, if the temperature is increased to $120^{0} C$ , what is the current flowing through that wire?