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Moving Charges and Magnetism question

2003 · Q134
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Moving Charges and Magnetism question

2003 · Q134

NEETPhysicsMoving Charges and MagnetismMCQ+4 / −1
A long solenoid carrying a current producess a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved, the new value of the magnetic field is
  1. A
    B/2
  2. B
    B
  3. C
    2B
  4. D
    4B
View written solutionFree

Correct answer: B

Magnetic field induction at point inside the solenoid of length l, having n turns per unit length carrying current i is given by

B = μ\mu μ0ni

If i →\to→ doubled, n →\to→ halved then B →\to→ remains same.

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