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Question
A wire has a diameter of 0.5 mm and a resistivity of 1.6 × 10−6 ohm cm. How much of this wire would be required to make a 10 ohm coil?
A wire has a diameter of 0.5 mm and a resistivity of 1.6 × 10−6 ohm cm. How much of this wire would be required to make a 10 ohm coil?
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Solution
The correct option is A 112.7 m
We are given that, Diameter of the wire, D = 0.5 mm = 0.5 × 10−3 m
resistivity of copper, r = 1.6 × 10−6 ohm cm
= 1.6 × 10−8 ohm m
required resistance, R = 10 ohm
112.7 m
We are given that, Diameter of the wire, D = 0.5 mm = 0.5 × 10−3 m
resistivity of copper, r = 1.6 × 10−6 ohm cm
= 1.6 × 10−8 ohm m
required resistance, R = 10 ohm
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