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Question
A conductor has three segments; two straights of length L and a semicircular with radius R. It carries a current I What is the magnetic field B at point P?
Options
`(mu_0 I)/(4piR)`
`mu_0/(4pi)I/R^2`
`(mu_0I)/(4R)`
`(mu_0I)/(4pi)`
Solution
`(mu_0I)/(4R)`
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