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Alternating Current

A 10Ω electric heater is connected to a 220V 50Hz mains supply. What is the peak value of the potential difference across the heater element ?

Alternating Current, Physics Mcqs /
A 10Ω electric heater is connected to a 220V 50Hz mains supply. What is the peak value of the potential difference across the heater element ?

A. 220V
B. 220/ 2V
C. 110V
D. 220 √2V

A 10Ω electric heater is connected to a 220V 50Hz mains supply. What is the peak value of the potential difference across the heater element ? Read More »

Alternating Current, Physics Mcqs

What is the self-inductance of a coil in which an induced emf of 2V is set up when the current changes at the rate of 4 As-1 ?

Alternating Current, Physics Mcqs /
What is the self-inductance of a coil in which an induced emf of 2V is set up when the current changes at the rate of 4 As-1 ?

A. 0.5 mH
B. 0.5H
C. 2.0H
D. 8.0H

What is the self-inductance of a coil in which an induced emf of 2V is set up when the current changes at the rate of 4 As-1 ? Read More »

Alternating Current, Physics Mcqs

When a pure inductor of inductance L and a pure capacitor of capacitance C are connected in parallel to a sinusoidal potential difference V the potential difference across both L & C will be_______________?

Alternating Current, Physics Mcqs /
When a pure inductor of inductance L and a pure capacitor of capacitance C are connected in parallel to a sinusoidal potential difference V the potential difference across both L & C will be_______________?

A. Same
B. Different
C. At L will be more than at C
D. At L will be less than at C

When a pure inductor of inductance L and a pure capacitor of capacitance C are connected in parallel to a sinusoidal potential difference V the potential difference across both L & C will be_______________? Read More »

Alternating Current, Physics Mcqs

A wire of resistance R is coiled inductively so that its inductance is L. The impedance of the coil at a frequency of f is_______________?

Alternating Current, Physics Mcqs /
A wire of resistance R is coiled inductively so that its inductance is L. The impedance of the coil at a frequency of f is_______________?

A. (R+2πfL)
B. R+1/2πfL
C. (R2+f2L2)
D. (R2+4π2f2L2)

A wire of resistance R is coiled inductively so that its inductance is L. The impedance of the coil at a frequency of f is_______________? Read More »

Alternating Current, Physics Mcqs

If a glass plate is inserted in between the plate of a capacitor in series with a lighted bulb the brightness of the bulb________________?

Alternating Current, Physics Mcqs /
If a glass plate is inserted in between the plate of a capacitor in series with a lighted bulb the brightness of the bulb________________?

A. Remains same
B. Brightness increases
C. Brightness decreases
D. No light

If a glass plate is inserted in between the plate of a capacitor in series with a lighted bulb the brightness of the bulb________________? Read More »

Alternating Current, Physics Mcqs

A 100µF capacitor with a 12V source in series having frequency 50Hz will offer a capacitive reactance of about______________?

Alternating Current, Physics Mcqs /
A 100µF capacitor with a 12V source in series having frequency 50Hz will offer a capacitive reactance of about______________?

A. 32Ω
B. 62Ω
C. 50Ω
D. 100Ω

A 100µF capacitor with a 12V source in series having frequency 50Hz will offer a capacitive reactance of about______________? Read More »

Alternating Current, Physics Mcqs

When A.C current passes through a capacitor then the current relationship will be_______________?

Alternating Current, Physics Mcqs /
When A.C current passes through a capacitor then the current relationship will be_______________?

A. The current lead voltage by phase angle is 90 degrees
B. The voltage leads current by phase angle is 90 degrees
C. The current lead voltage by phase angle is 45 degrees
D. The voltage leads current by phase angle is 45 degrees

When A.C current passes through a capacitor then the current relationship will be_______________? Read More »

Alternating Current, Physics Mcqs