A long solenoid carrying a current produces a magnetic field 
along its axis. Ifthe current is doubled and the number of turns per cm is halved, the new value of the magnetic field is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Magnetic field induction at point inside the solenoid of length 
, having 
turns per unit length carrying current i is given by 
If 
doubled, 
halved then 
remainssame.
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