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A circular coil of radius with turns carries a current . What is the magnetic field at the center of the coil?
- A.
- B.
- C.
- D.
Show correct answer & step-by-step solution
Correct answer: C —
Solution
- The magnetic field due to a single loop at its center is .
- For a coil with turns, the fields add up linearly.
- Thus, the total field is .
- Hence the answer is (C).
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