AQA A Level Physics 3.7.1 Fields

What is a force field?

• An area where non-contact forces exist

• An area where contact forces exist

• Any repulsive force

• Any attractive force

Which fields are included on your course?

• Gravitational

• Electric

• Magnetic

• Quantum

• Pressure

Match the force fields to the property they exert a force on:

• Electric fields

• Charges

• Incorrect

• Moving charges

• Gravitational fields

• Moving masses

• Magnetic fields

• Mass

Where do we find radial fields?

• Around a point mass

• Around a point charge

• Between electrically charged plates

• At small scales on the surface of a mass

• Between opposite poles of a magnet

Where do we find uniform fields?

• Around a point mass

• Around a point charge

• Between electrically charged plates

• At small scales on the surface of a mass

• Between opposite poles of a magnet

What do the directions of the field lines indicate?

• The strength of the field

• The direction of force exerted on a test object

• The pressure exerted on a test object

• The locations of equal potential

What does the concentration of the field lines indicate?

• The strength of the field

• The direction of force exerted on a test object

• The pressure exerted on a test object

• The locations of equal potential

What happens when similar fields exist in the same space?

• They interact

• Nothing

• They add together

• They cancel

What direction do these field lines flow?

• Magnetic field lines

• North to south

• Incorrect

• Outwards from the centre

• Electric field lines

• Towards the centre

• Gravitational field lines

• Positive to negative

Compare and contrast these fields:

Groups:

(a) Gravitational fields only

,

(b) Electric fields only

,

(c) Both

,

(d) Neither

• Radial

• Uniform

• Weak

• Repulsive only

• Attractive only

• Strong

• Attractive and repulsive