For an inductor, the A) voltage lags behind the current. B) current lags behind

Question

For an inductor, the

A) voltage lags behind the current.

B) current lags behind the voltage.

C) current and the voltage are in phase.

D) current–voltage phase angle is greater than 90 degrees.

E) current–voltage phase angle is less than 90 degrees.

For a capacitor, the

A) voltage lags behind the current.

B) current lags behind the voltage.

C) current and the voltage are in phase.

D) current–voltage phase angle is greater than 90 degrees.

E) current–voltage phase angle is less than 90 degrees.

Which of the following statements about a capacitor that is connected to an AC voltage is true?

A) The average power dissipated by the capacitor is zero.

B) At low frequencies the capacitor behaves like an open circuit.

C) At high frequencies the capacitor behaves like a short circuit.

D) At any given instant the net charges on the capacitor is zero.

E) All the above statements are true

As the frequency in this simple AC circuit increases, the rms power dissipated by the resistor

A) increases.

B) does not change.

C) may increase or decrease depending on the magnitude of the original frequency.

D) may increase or decrease depending on the magnitude of the resistance.

E) decreases.

A cyclotron

A) accelerates particles electrically.

B) accelerates particles magnetically.

C) guides particles magnetically.

D) gives the same period to all particles with the same charge-to-mass ratio.

E) is described by all of these.

Explanation / Answer

For an inductor - Option (B) Current lags behind the voltage is the correct answer.

also since in purely inductive circuit the current lags the voltage by 90 degree, so only the above option is correct.

For a capacitor - Option (A) Voltage lags behind the current is the correct option.

For a capacitor, Impedance = 1/(2*pi*f*C)

So, at low frequency the capacitor acts as open circuit

and at higher frequency, it will act as short circuit.

Further, average power dissipated by a capacitor is ZERO.

So, for the third problem option (E) is the correct answer.

Again for pure resistance, power dissipated is independent is frequency. It depends only on the value of the resistance.

So, for the fourth problem option (D) is the correct answer.

Again, a cyclotron is an apparatus whereby the subatomic and charged atomic particles are accelerated by an alternating electric field.

So, for the fifth problem, option (A) is the correct answer.

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