Question

does the current in the circuit change when the length or area or cross section of the material of the conductor is changed​

Answer 1

• We know that the resistance of wire of length L and of cross section area A is R= AρL

• where ρ= resistivity of metal of the wire.
• When length and cross section are doubled, the resistance becomes
• R = (2A)ρ(2L) = AρL

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