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प्रश्न
A very long straight wire carries a current of 5.2 A. What is the magnitude of the magnetic field at a distance 3.1 cm from the wire?
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उत्तर
Given: a = 3.1 cm = 0.031 m
μ0 = 4π × 10−7 T m/A
Formula: The magnetic induction,
B = `(mu_0I)/(2pia)`
B = `(4pi xx 10^-7 xx 5.2)/(2pi xx 0.031)`
= `(2 xx 10^-7 xx 5.2)/(0.031)`
= `(10.4 xx 10^-7)/(0.031)`
= 3.35 × 10−5 T
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