Question: (a) Given a copper wire with radius (850 mu mathrm{m}) carrying a uniform current of (25 mathrm{~mA}), calculate the magnitude of electric field applied to

(a) Given a copper wire with radius $850 \mu \mathrm{m}$ carrying a uniform current of $25 \mathrm{~mA}$, calculate the magnitude of electric field applied to this wire.

(b) We have given two types of wire made up of copper and aluminum. If these wires are of the same length, radius, and carry same current, which wire has higher electric field?

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