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प्रश्न
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?
विकल्प
`(mu_0 I)/(4piR)`
`mu_0/(4pi)I/R^2`
`(mu_0I)/(4R)`
`(mu_0I)/(4pi)`
उत्तर
`(mu_0I)/(4R)`
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