A student has a long solenoid of 1000 turns wound uniformly over a length of 0.5 m
PHYSICS · Single correct · CBSE · Physics · Magnetic Effects of Electric Current · Magnetic Effects of Electric Current
Problem
A student has a long solenoid of 1000 turns wound uniformly over a length of 0.5 m. The solenoid carries a steady current of 2 A. Which single change below will approximately double the magnetic field inside the solenoid while keeping the current unchanged?
(a) Inserting a soft iron core into the solenoid
(b) Removing alternate turns so that only 500 turns remain
(c) Reducing the solenoid’s length to 0.25m by compressing the turns
(d) Doubling the diameter of the solenoid