Electromagnetic Properties | MCQs

Explanation

Answer:

C

The coil of the iron core is called an electromagnet. The iron core increases the magnetic field strength of the coil. Wrap a wire around an iron nail to make a simple electromagnet.

Explanation

Inductance ($L$) is primarily influenced by the following factors:

1. Number of Turns:

   The inductance increases with an increase in the number of turns in the coil. More turns create a stronger magnetic field, which enhances inductance.

2. Area of the Coil:

   The larger the cross-sectional area of the coil, the greater the inductance, as it can enclose more magnetic flux.

3. Length of the Coil:

   The inductance decreases with an increase in the length of the coil. A longer coil has a weaker magnetic field for a given current.

4. Core Material:

   The material around which the coil is wound (the core) affects inductance. Ferromagnetic materials increase inductance due to their higher permeability compared to air or non-magnetic materials.

Explanation

Inside a solenoid, the magnetic field is:Uniform and directed along the axis of the solenoid.

 The field lines are parallel and evenly spaced, indicating a strong and consistent magnetic field inside the solenoid.