ELECTROMAGNETISM

Question 1

How can you investigate the magnetic field around a current-carrying conductor?

Answer 1

Use iron filings or a compass around:

A straight wire – field forms concentric circles.

A flat coil – field pattern similar to a bar magnet.

A solenoid – field is uniform inside, like a bar magnet with poles.

Question 2

What is the Right Hand Grip Rule?

Answer 2

For current in a straight wire or solenoid:

Grip the wire with your right hand.

Thumb points in direction of current.

Fingers curl in direction of magnetic field lines.

Question 3

What is the Right Hand Screw Rule

Answer 3

If you imagine turning a screw in the direction of current:

The direction the screw rotates is the direction of the magnetic field.

Question 4

What is a common commercial use of electromagnets?

Answer 4

Starter motors in cars use electromagnets to turn the engine.

Magnetic relays use electromagnets to switch circuits on and off remotely.