A) directly proportional to its length
B) directly proportional to current
C) inversely proportional to number of turns
D) inversely proportional to current
Correct Answer: A
Solution :
Magnetic field within the solenoid is uniform and parallel to the axis of the solenoid. Magnetic field is given by \[B={{\mu }_{0}}ni\]
where i is current, n the number of turns. Hence, \[B\propto i\]
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