A 
long solenoid has winding of 400 turns. What current must pass through it to produce a magnetic field of induction 
at the centre ?
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Given,
Length of solenoid, 
No. of turns, 
Magnetic field at the centre of solenoid, 
Number of turns per unit length,
Magnetic field at the center of solenoid,
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