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An equilateral triangle of side a carrie...

An equilateral triangle of side a carries a current I . Magnetic field at point P which is vertex of triangle is (A) `frac{mu_0I}{2sqrt3pia}` `o.` (B) `frac{mu_0I}{2sqrt3pia}` `ox` (C) `frac{9mu_0I}{2pia}``o.` (D) `frac{9mu_0I}{2pia}``ox`

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