Revision Year 11 Topics: The Basics

What are magnetic materials?

• Materials that can be attracted by magnets

• Materials that cannot be attracted by magnets

• Materials that can become magnets

Which statement is NOT TRUE about magnetic field?

• The field direction is from South to North

• The field lines are continuous

• Near field lines indicates weaker magnetic field

What should we do to demagnetise a magnet?

• Put it into a solenoid connected with direct current

• Put it into a solenoid connected with direct current then slowly remove it

• Put it into a solenoid connected with alternating current then slowly remove it

Which statement is TRUE about soft magnetic materials?

• Soft magnetic material are materials that can be easily magnetised and demagnetised like iron

• Soft magnetic material are materials that can be easily magnetised and demagnetised like steel

• Soft magnetic material are materials that cannot be easily magnetised and demagnetised like steel

In a solenoid carrying current, the magnetic field of the solenoid can be increased by

• Increasing the current

• Decreasing the number of turns of coil

• Inserting an iron core

Which statements are CORRECT about Fleming's Left Hand Rule?

• The thumb indicate the direction of magnetic field

• The first finger (jari telunjuk) indicates the direction of force

• The second finger (jari hantu) indicates the direction of current

In a DC Motor, the ends of the coil is connected with..

• Split rings

• Slip rings

• magnets

What happens in electromagnetic induction?

• Current flows in a conductor, then e.m.f is induced and it experiences a changing magnetic field

• A conductor experiences a constant magnetic field, then e.m.f. is induced in that conductor and current flows

• A conductor experiences a changing magnetic field, then e.m.f. is induced in that conductor and current flows

In an AC generator, if we double the speed of the rotation of the coil, the e.m.f. is...

• doubled

• halved

• no change

In a transformer, the voltage in the secondary coil is bigger than the voltage in the primary coil. This means the number of turns in the secondary coil is __________ than/to the number of turns in the primary coil

• bigger

• smaller

• equal