Electric Fields

In the study of electrostatics, the symbol Q represents

• electrical force

• static field

• quantity of charge

• quantity of force

In an electric field, when the field lines become further apart, the field strength becomes

• stronger

• equal to the force

• weaker

• equal to the charge

According to Coulomb's Law, if the magnitude of one charge is doubled then the force will be

• halved

• doubled

• squared

• unchanged

If the charge on 1 electron is -1.6 x 10^-19, then the charge on 1 proton must be

• -1.6 x 10^-19

• +1.6 x 10^-19

• -1.6 x 10⁹

• +1.6 x 10⁹

According to Faraday's Law, when the length of the wire is doubled, the electromotive force

• is doubled

• is halved

• is squared

• remains the same

What did Lenz notice about induced currents?

• The direction of current creates a magnetic field that opposes the magnetic field used to induce it.

• The direction of current creates a magnetic field that aligns with the magnetic field used to induce it.

• They increase the magnetic flux density of the field used to create the current.

• The direction of the current alternates between clockwise and anticlockwise.

If the north pole of a magnet approaches a solenoid, the direction of the induced current

• creates a magnetic field with its north pole facing the north pole of the approaching magnet.

• creates a magnetic field where poles are not determined until the magnet is half-way through the solenoid.

• creates a magnetic field where poles are determined once the magnet exits the solenoid.

• creates a magnetic field with its north pole facing the north pole of the approaching magnet.

Work is not done on a charged particle in an electric field when the charged particle moves

• away from the magnetic field

• closer to the magnetic field

• perpendicular to the field lines

• parallel to the field lines

Which diagram correctly shows the electric field around a negative charge?

• A

• B

• they are both positive

Which graph best represents the relationship between the strength of an electric field and distance from a point charge?

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