Question

Strength of the magnetic field can be increased by

• A. increasing the number of coils in the solenoid
• B. using a soft iron core within the solenoid
• C. increasing the current flowing in loop
• D. none of these

Answer 1

Answer: (A), (B), (C)

increasing the current flowing in loop

The magnetic field inside a solenoid is proportional to both the applied current and the number of turns per unit length. Similarly when a soft iron bar/core is placed inside the solenoid, it magnetizes the iron bar thereby increasing the strength of the magnetic field inside the solenoid.