Magnetism Quiz

What is the shape of the magnetic field around a bar magnet?

• Circular

• Straight lines

• Elliptical

• Spiral

What happens to the magnetic field lines when two like poles are brought close to each other?

• They attract each other

• They repel each other

• They become straight

• They disappear

Which of the following is NOT true about magnetic poles?

• Opposite poles attract each other

• Like poles repel each other

• A single magnetic pole can exist independently

• Magnetic poles always come in pairs

What is the principle of electromagnetic induction?

• A current is induced in a coil when it is moved through a magnetic field

• A magnetic field is induced around a current-carrying wire

• A magnetic field can induce another magnetic field

• A current can only be induced by another current

What is the effect of increasing the number of coils in an electromagnet on its magnetic field strength?

• Decreases the magnetic field strength

• Increases the magnetic field strength

• No effect on the magnetic field strength

• Initially increases then decreases the magnetic field strength

What is the direction of the magnetic force on a positive charge moving in a magnetic field?

• Parallel to the magnetic field

• Antiparallel to the magnetic field

• Perpendicular to the magnetic field

• In the direction of motion of the charge

What is the phenomenon of inducing a voltage in a coil due to a change in magnetic flux through it called?

• Magnetic induction

• Electromagnetic induction

• Magnetic polarization

• Electrostatic induction

Which of the following is a property of magnetic field lines?

• They intersect at the poles

• They originate from the south pole and end at the north pole

• They are closest together where the magnetic field is weakest

• They never intersect each other

What is the effect of inserting an iron core into a coil of wire on the coil's magnetic field?

• Decreases the magnetic field strength

• Increases the magnetic field strength

• No effect on the magnetic field strength

• Initially increases then decreases the magnetic field strength

What is the main difference between an electromagnet and a permanent magnet?

• An electromagnet can be turned on and off

• A permanent magnet can be easily demagnetized

• Electromagnets do not have magnetic poles

• Permanent magnets can generate electricity