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# Magnetic field quiz ## Topic Quiz on Magnetic Fields

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## Magnetic fields are made by...?

Electric Currents
Gravity
Friction
Heat

Nanoteslas
Amperes
Microteslas
Newtons

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
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

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.

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.

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