Magnets and Electromagnets Mastery Quiz

What is the shape of the magnetic field around an electric current?

• Circular

• Straight lines parallel to the conductor

• Radially outward from the conductor

• Elliptical

Which of the following materials is not a magnetic material?

• Iron

• Cobalt

• Nickel

• Copper

What is the principle behind an electromagnet?

• Permanent magnetism

• Magnetic induction

• Electromagnetic induction

• Electric current producing a magnetic field

What happens to the magnetic field strength of an electromagnet when the current through the coil is increased?

• It decreases

• It remains the same

• It increases

• It becomes zero

Which law helps in determining the direction of the magnetic field around a current-carrying conductor?

• Coulomb's law

• Ampere's law

• Faraday's law

• Right-hand thumb rule

Which of the following is a characteristic of permanent magnets?

• They can be easily demagnetized by heating.

• They always attract all metal objects.

• They stay magnetic over a long period.

• They can be made by passing an electric current through a coil.

What is the effect of inserting a soft iron core into a solenoid?

• Decreases the magnetic field strength

• Increases the magnetic field strength

• Changes the direction of the magnetic field

• Has no effect on the magnetic field