AIPMT PRELIMS2003Physics-Magnetism
AIPMT PRELIMS 2003 Physics Magnetic Field in Solenoids MCQ Question
Type: MCQ-conceptual-Medium-Class 12
A long solenoid carrying a current produces 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 -
A
B/2
B
B
C
2B
D
4B
Correct Answer
Option B
Detailed Explanation
The magnetic field inside a solenoid is given by . If the current is doubled and the number of turns per cm is halved, the product remains the same, so the magnetic field remains unchanged.
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