Question

The magnetic field at all points inside a solenoid carrying electric current:

• A. is non-uniform
• B. is uniform
• C. does not exist
• D. is always zero

Hint:

The magnetic field inside a long solenoid is approximately uniform.

Answer 1

The Correct Option is B

Step 1: Understand the magnetic field of a solenoid.
A solenoid is a coil of wire that creates a magnetic field when current flows through it. Step 2: Describe the magnetic field inside an ideal solenoid.
For an ideal (long and tightly wound) solenoid, the magnetic field lines inside are parallel to the axis and evenly spaced. This indicates a uniform magnetic field in both magnitude and direction. Step 3: Consider real solenoids.
In real solenoids, the field is most uniform in the central region, away from the ends. The approximation of a uniform field inside is generally good for long solenoids.