Magnetic field quiz

Quiz Questions And Answers

Magnetic fields are made by...?

Electric Currents

Gravity

Friction

Heat

Electric currents are measured in...?

Nanoteslas

Amperes

Microteslas

Newtons

Lines signify the strength of magnetic fields. If the lines are denser the magnetic field is...?

Weaker

Slower

Normal

Stronger

What causes magnetism?

Charged electric particles

Friction

Gravity

Earth's atmosphere

The magnetic field of a solenoid is:

like a bar magnet

radial

linear

cancels out to zero.

Which one of the following statements about a magnetic field and an electric current is NOT true?

All electric currents make magnetic fields.

It is impossible to have a magnetic field without an electric current flowing in a wire.

The direction of the force on an electric current carrying wire in a magnetic field is determined by Fleming's Left Hand

The direction of the field made by a single wire carrying a current is determined by the corkscrew, or screwdriver rule

Which of these are important when working out the VALUE of the force on a charge.

The value of the charge

The direction of the magnetic field

Mass of the particle

The strength of the magnetic field

The radius of the path of a charged particle of mass m, velocity v, in a magnetic field of strength B is given by the formula:

r = Bqv/m

r = qvm/B

r = Bq/mv

r = mv/Bq

Which one of the following best describes flux linkage?

The concentration of magnetic field lines.

The total number of field lines.

The total number of field lines multiplied by the number of turns of wire.

The rate at which field lines are cut.

Which one of the following statements is true about the induction of an emf in a wire by a magnetic field.

A steady magnetic field will induce a steady emf

Only a moving magnetic field will induce an emf.

A changing flux linkage always induces a current in a wire.

If there is a circuit, the induced current has a direction that opposes the change.

ANSWERS

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