A uniform current-carrying narrow solenoid produces
uniform magnetic field inside the solenoid
A long, narrow, tightly-wound solenoid carrying a steady current produces a magnetic field that is nearly uniform in magnitude and direction throughout its interior, running parallel to the solenoid's axis, much like the field inside a bar magnet.
Outside the solenoid, the field lines spread out and weaken rapidly with distance, so the field there is not uniform, ruling out the second option. The field lines are also not straight everywhere (they curve back outside the solenoid), and the field does not oscillate for a steady (DC) current, ruling out the remaining options.
Hence, a current-carrying solenoid produces a uniform magnetic field inside itself.
Important Questions from Magnetism
How many of the following materials can be attracted by a magnet?
1. Plastic
2. Carbon
3. Aluminium
4. Stainless Steel
Select the correct answer using the code given below:
What will happen if a collection of positive and negative charges are passed at a high speed through a magnetic field which is perpendicular to the direction of motion of the charges? (Assume that both kind of charges are NOT going to recombine)
Which scientist suggested that the magnet must also exert an equal and opposite force on the current-carrying conductor?
Paramagnetic substances are-
The magnetic field lines produced inside a long current-carrying solenoid is similar to that of a:
