Unit- 6 & 9 - Earth Physics

True/False: The magnetic field is strongest at the poles of a magnet.

• True

• False

Fill in the blank: The shape of a magnetic field around a bar magnet can be visualized using (a)   .

A bar magnet with field lines around it. Which of the following correctly describes the direction of magnetic field lines?

• They travel from the south pole to the north pole.

• They travel from the north pole to the south pole.

• They are circular and do not have a direction.

Identify the type of force (attraction or repulsion) between the poles shown in the image.

• N-S Attraction

• N-N or S-S Repulsion

Fill in the blank: To create an electromagnet, you need a coil of wire, a (a)   core, and an electric current.

True/False: An electromagnet will remain magnetic even if the current is switched off.

• True

• False

MCQ: Which of the following is NOT an application of an electromagnet?

• Doorbells

• Cranes used in scrapyards

• Solar panels

MCQ: You wind a coil of wire around a nail and connect it to a battery. How can you increase the strength of the electromagnet?

• Increase the number of coils

• Increase the current

• Use a soft iron core.

• All of the above

MCQ: Which of the following factors will NOT affect the strength of an electromagnet?

• The number of coils

• The material of the core

• The shape of the battery

True/False: Increasing the current flowing through the wire will make an electromagnet stronger.

• True

• False