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Problem 7 - Olympiad
A circular coil of radius $ R $ carries current $ I $. What is the magnetic field at the center?
A. $ rac{mu_0 I}{2R} $
B. $ rac{mu_0 I}{2pi R} $
C. $ rac{mu_0 I}{R} $
D. $ rac{2mu_0 I}{R} $
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Correct: A
The formula for a circular loop's magnetic field at the center is $ B = rac{mu_0 I}{2R} $.