Question 1

Which statement about magnetic poles is correct?

Accepted Answer

Like poles repel each other.. Like poles repel, so the marked statement is correct. Unlike poles attract each other in ordinary magnets. A bar magnet always has two poles, north and south.

Question 2

What is the SI unit of magnetic flux density (B)?

Accepted Answer

Tesla. Magnetic flux density is measured in tesla in SI units. It describes how strong the magnetic field is in a region. A larger tesla value means a stronger field.

Question 3

Outside a bar magnet, magnetic field lines generally go from?

Accepted Answer

North pole to south pole. Outside a magnet, field lines are taken to emerge from the north pole and enter the south pole. This direction matches the way a compass north end points. Inside the magnet, the lines return from south to north.

Question 4

A compass needle placed near a magnet aligns mainly because it?

Accepted Answer

Experiences torque due to a magnetic field. A compass needle is a small magnet, so a magnetic field exerts a torque on it. The needle rotates until it aligns with the local magnetic field direction. The north-seeking end points along the field lines.

Question 5

Which statement about Earth and magnetism is generally correct?

Accepted Answer

Earth behaves like a giant magnet.. Earth has a magnetic field and behaves like a giant magnet. The field helps guide compass needles for navigation. It also helps deflect many charged particles from space.

Magnetism — Set 1