Consider a resistor of uniform cross-sectional area connected to a battery of internal resistanc...

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Consider a resistor of uniform cross-sectional area connected to a battery of internal resistance zero. If the length of the resistor is doubled by stretching it, then
(1) the current will become four times
(2) the electric field in the wire will become half
(3) the thermal power produced by the resistor will become onefourth
(4) the product of the current density and conductance will become half
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