fourth quarter review Quiz

What does magnetic induction measure?

• Magnetic force

• Magnetic flux

• Electric current

• Electric potential

Who discovered electromagnetic induction?

• Albert Einstein

• Michael Faraday

• Nikola Tesla

• James Clerk Maxwell

What is the SI unit of magnetic flux?

• Weber (Wb)

• Tesla (T)

• Henry (H)

• Ampere (A)

What device is used to measure magnetic flux?

• Voltmeter

• Magnetometer

• Ammeter

• Fluxmeter

Faraday's Law states that induced emf is proportional to the rate of change of:

• Electric charge

• Electric current

• Magnetic flux

• Resistance

What happens when a conductor is moved parallel to a magnetic field?

• Current is induced

• No current is induced

• Magnetic field becomes zero

• Magnetic flux decreases

What does Lenz's Law describe?

• The direction of induced emf

• The magnitude of current

• The strength of the magnet

• The resistance of a circuit

In a purely inductive AC circuit, the current lags behind the voltage by:

• 90°

• 180°

• 270°

• 360°

The time constant of an LC circuit is determined by:

• Capacitance only

• Inductance only

• Both capacitance and inductance

• Resistance only

What is the energy stored in an inductor with an inductance of 5 H and a current of 3 A?

• 7.5 J

• 22.5 J

• 45 J

• 90 J