Physics-Alternating Current And Electromagnetic Waves

Test Preparation on Physics - Alternating Current And Electromagnetic Waves

1.

The A.C. current is given by J = 20 sin of when the current is expressed in amperes, the RMS value of current will be :

120
220?2
320/?2
410

2.

The rms value of current in an A.C. of 50 Hz is 10 amp. The time is taken by the alternating current in reaching from zero to a maximum value and the peak value will be respectively :

12 x 10-2 s and 14.14 amp
21 x 10-2 s and 7.07 amp
35 x 10-3 s and 7.07 amp
45 x 10-3 s and 14.14 amp

3.

A group of electric lamps having a total power rating of1000 watts is supplied by an A.C. voltage = 200 sin (310t + 60

110 amp
210?2 amp
320 amp
420?2 amp

4.

The phase difference between the current and voltage at resonance is :

10
2p/2
3p
4-p

5.

The phase angle between emf and current in LCR seriesA.C. circuit is :

10 to p/2
2p/4
3p/2
4p

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