CP Ch10.4 Magnetic Forces

How are electric motors essentially modified galvanometers described?

• They produce continuous rotation by changing the direction of the current.

• They produce intermittent rotation by changing the direction of the current.

• They produce continuous rotation by changing the magnitude of the current.

• They produce intermittent rotation by changing the magnitude of the current.

What can galvanometers be calibrated to measure?

• Resistance

• Temperature

• Current

• Pressure

How can electric meters detect electric current?

• By using gravitational fields

• By using magnetic fields

• By using electric fields

• By using heat conduction

When is the deflecting force on charged particles greatest?

• When they move parallel to the magnetic field lines

• When they move at right angles to the magnetic field lines

• When they move in a circular path

• When they move in a straight line

In what direction is the force acting on a charged particle in relation to the magnetic field lines and its velocity?

• Parallel

• Perpendicular

• Opposite

• Random

Why do charged particles need to be moving to interact with a magnetic field?

• Because stationary charged particles do not produce a magnetic field

• Because moving charged particles create a magnetic field

• Because magnetic fields only affect moving charged particles

• Because stationary charged particles are not affected by magnetic fields

What are some practical applications of the deflection of charged particles by magnetic fields?

• Generating electricity

• Protecting Earth from cosmic rays

• Cooking food faster

• Creating rainbows