Physics Quiz - Alternating Current

What is the most common shape of an alternating current?

• Sawtooth wave

• Triangle wave

• Sine wave

• Square wave

What is the average value of a square of any AC wave?

• Negative

• Zero

• Depends on the frequency

• Positive

What is the unit of inductance?

• Volt

• Ampere

• Henry

• Ohm

What is the time constant for an inductor?

• Time after which the current reaches 50% of its final value

• Time after which the current reaches 63% of its final value

• Time after which the current reaches 75% of its final value

• Time after which the current reaches 90% of its final value

What is the power expended by the battery in an inductor-resistor circuit equal to?

• None of the above

• Both A and B

• Work done on the inductor

• Energy dissipated in the resistor

What is the energy stored in an inductor carrying current?

• LI^2

• 0.5LI^2

• 2LI^2

• 3LI^2

What happens when a capacitor and an inductor are connected in an LC circuit?

• Energy is lost

• Energy is transferred from the inductor to the capacitor

• Energy is transferred from the capacitor to the inductor

• Energy remains constant

What is the frequency of the electromagnetic oscillations in an LC circuit?

• 1/LC

• 1/2π√(LC)

• 1/RC

• 2π√(LC)

What is the unit of inductance?

• Henry

• Ohm

• Volt

• Ampere

What is the time constant for an inductor?

• Time after which the current reaches 50% of its final value

• Time after which the current reaches 75% of its final value

• Time after which the current reaches 63% of its final value

• Time after which the current reaches 90% of its final value