2Q_PRE TEST_Electricity and magnetism

Which are TRUE about an electric motor?

I. It uses magnets to create a circular motion.

II. It uses magnets to create rotational motion.

III. It converts electrical energy into a mechanical one.

IV. It depends on the interaction of magnetic and electric fields.

• I and II

• II and III

• I and III

• II and IV

Which transformation of energy takes place in an electric generator?

• chemical to electrical

• electrical to mechanical

• electrical to chemical

• mechanical to electrical

Which principle works with an electric motor and generator respectively?

• Faraday’s Law and Ampere’s Law

• Fleming’s Right-Hand Rule and Electromagnetic induction

• Electromagnetic induction and current-carrying conductor inducing a magnetic field

• Current-carrying conductor inducing a magnetic field and electromagnetic Induction

In which part of an electric motor is electric current supplied to create

magnetic force?

• armature

• brushes

• commutator

• stator

In which part of an electric generator is an electric current produced due to

the induced electromotive force (emf)?

• armature

• brushes

• commutator

• stator

Which statements are TRUE?

I. Magnetic force is the push or pulls in a magnet.

II. Electric field is the region around an electric charge.

III. Magnetism is possible in a non-current carrying wire.

IV. Electric field is the push or pulls experienced by an object in an electric field.

• I and II

• II and III

• III and IV

• I and IV

If you were to device your own generator, which of the following setup would be the best option?

• A long wire with a large loop and a strong magnet

• A series of large coils and a regular magnet.

• A circuit with multiple loops and a strong magnet.

• A long wire exposed to series of strong magnets.

Which shows the correct energy input?

• Motors: Mechanical energy ;

    Generators: Mechanical energy

• Motors: Electrical energy ;

    Generators: Electrical energy

• Motors: Electrical energy ;

    Generators: Mechanical energy

• Motors: Mechanical energy ;

    Generators: Electrical energy

According to Fleming’s Left-Hand Rule, a current-carrying wire receives no force of the magnetic field __________

• at 45° to the magnetic field.

• at a right angle to the magnetic field

• parallel to the magnetic field.

• at an oblique position to the magnetic field.

In which position an electric motor experiences a strong magnetic force?

• Illustration A

• Illustration B

• Illustration C

• Illustration D