Find the radius of wire of length 100m needed
to prepare a coil of resistance 25 ohm (Resitivity of
Material is 3.14×10^-7 ohm m)
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Answer:
r= 2×10^-7
Explanation:
Resistance= resistivity×length/area
25ohm = 3.14×10^-7×100/3.14×r^2
r^2 = 4 ×10^-7
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