JEE Advanced · PhysicsHard
A solenoid of length and radius has turns per unit length. It carries a current . What is the magnetic field at the center of the solenoid if it is very long ()?
- A.
- B.
- C.
- D.
Show correct answer & step-by-step solution
Correct answer: B —
Solution
Using Ampere's Law, . For along solenoid, , which simplifies to .
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