The current in the shown circuit is found to be 4 sin 314 t - π 4 A . Find the value of inductance.

The current in the circuit I = 4 sin 314 t - π 4 A From the expression of the current, angular frequency ω = 314 s - 1 and phase angle ϕ = π 4 Electric resistance of the circuit R = 314 Ω From the phasor diagram tan ϕ = X L R ⇒ tan π 4 = X L 314 ⇒ X L = 314 Ω , and X L = ω L ⇒ L = 314 314 ⇒ L = 1 H

E M B I B E

Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>BEGINNER'S BOX - 2>Q 1

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IMPORTANT

Earn 100

The figure given below shows the variation of an alternating emf with time. What is the average value of the emf for the shaded part of the graph?

Important Questions on Alternating Current

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>BEGINNER'S BOX - 2>Q 2

A voltage

V = 60 \sin (π t)

volt is applied across a

20 Ω

resistor. What will an ac ammeter in series with the resistor read?

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>BEGINNER'S BOX - 2>Q 3

An alternating current source

E = 100 \sin (1000 t) V

is connected through an inductor of

10 μ H

then write down the equation of current.

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>BEGINNER'S BOX - 2>Q 4

An alternating voltage

E = 200 \sqrt{2} \sin (100 t) V

is applied to

2 H

inductor through an a.c. ammeter. What will be reading of the ammeter?

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>BEGINNER'S BOX - 2>Q 5

A

15.0 μF

capacitor is connected to a

220 V, 50 Hz

source. Find the capacitive reactance and the current (RMS and peak) in the circuit. If the frequency is doubled, what happens to the capacitive reactance and the current?

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>BEGINNER'S BOX - 2>Q 6

A