Unit 3 AOS 1Fields Revision

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• Charges are both positive

• Charges are both negative

• Charges can be either both positive or both negative

• Left charge is positive, right charge is negative

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• 0.8 ms^-2

• 1.5 ms^-2

• 3.8 ms^-2

• 9.8 ms^-2

Which one of the following gives the speed of the positron as it exits the magnetic field?

• 0 ms^-1

• much less than 1.4 x 10⁶ ms^-1

• 1.4 x 10⁶ ms^-1

• greater than 1.4 x 10⁶ ms^-1

The speed of the positron changes to 7.0 x 10⁵ ms^-1 . Which one of the following gives the best value of r at this speed?

• r

• 2r

Magnetic and Gravitational forces have a variety of properties. Which of the following best describes the attraction/repulsion properties of magnetic and gravitational forces?

• M-Forces: Either Attract or Repel

  G-Forces: Only Attract

• M-Forces: Only repel

  G-Forces: Neither attract nor repel

• M Forces: Only attract

  G-Forces: Only attract

• M Forces: Either attract or repel

  G Forces: Either attract or repel

The electric field between two parallel plates that are 1.0 x 10^-2 m apart is 2.0 x 10^-4 NC^-1 . Which one of the following is closest to the voltage between the plates?

• 2.0 x 10^-8 V

• 2.0 x 10^-6 V

• 2.0 x 10^-4 V

• 1.0 x 10^-2 V

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The magnitude of the acceleration due to gravity at Earth’s surface is g.

Planet Y has twice the mass and half the radius of Earth. Both planets are modelled as uniform spheres.

Which one of the following best gives the magnitude of the acceleration due to gravity on the surface of Planet Y?

• 1g

• 4g

• 8g

A wire carrying a current, I, of 6.0 A passes through a magnetic field, B, of strength 1.4 × 10–5 T, as shown

below. The magnetic field is exactly 1.0 m wide.

• 0N

• 2.3 × 10^-6 N

• 8.4 × 10^-5 N

• 4.3 × 10⁵ N

A Van de Graaff generator, which is a piece of electric field demonstration equipment, consists of a small

sphere that is electrically charged, as shown in the diagram to the left.

A particular Van de Graaff generator has a sphere that has a charge of 5.0 × 10–7 coulombs on it. Take the

Coulomb’s law constant to be k = 9.0 × 109 N m2 C−2.

Which one of the following best gives the magnitude of the electric field at point X in the diagram above,

0.50 m from the sphere?

• 1.8 × 10^-2 V m^-1

• 3.6 × 10^-2 V m^-1

• 1.8 × 10⁴ V m^-1

• 3.6 × 10⁴ V m^-1