Basic Quantities in AC
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PHXII07:ALTERNATING CURRENT

356059 The frequency of \(ac\) mains in India is

1 \(30\,c/s\,{\mathop{\rm or}\nolimits} \,Hz\)
2 \(50\,c/s\,{\mathop{\rm or}\nolimits} \,Hz\)
3 \(60\,c/s\,{\mathop{\rm or}\nolimits} \,Hz\)
4 \(120\,c/s\,{\mathop{\rm or}\nolimits} \,Hz\)
PHXII07:ALTERNATING CURRENT

356060 If reading of an ammeter is 20\(A\), then the peak value of current is:

1 \(\frac{{20}}{{\sqrt 2 }}A\)
2 \(\frac{5}{{\sqrt 2 }}A\)
3 \(20\sqrt 2 A\)
4 \(20\sqrt 2 \)
PHXII07:ALTERNATING CURRENT

356061 The peak value of the alternating current given by \({I=4 \sin \omega t+4 \sin (\omega t+2 \pi / 3)}\) is

1 \({4 \sqrt{2}}\)
2 \({2 \sqrt{2}}\)
3 8
4 4
PHXII07:ALTERNATING CURRENT

356062 If the rms current in a 50 \(Hz\) \(AC\) circuit is 5 \(A\), the value of the current 1/300 seconds after its value becomes zero is

1 \(5\sqrt {3/2} \,{\rm{A}}\)
2 \(5\sqrt 2 \,{\rm{A}}\)
3 \(5/\sqrt 2 \,{\rm{A}}\)
4 \(5/6\,{\rm{A}}\)
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PHXII07:ALTERNATING CURRENT

356059 The frequency of \(ac\) mains in India is

1 \(30\,c/s\,{\mathop{\rm or}\nolimits} \,Hz\)
2 \(50\,c/s\,{\mathop{\rm or}\nolimits} \,Hz\)
3 \(60\,c/s\,{\mathop{\rm or}\nolimits} \,Hz\)
4 \(120\,c/s\,{\mathop{\rm or}\nolimits} \,Hz\)
PHXII07:ALTERNATING CURRENT

356060 If reading of an ammeter is 20\(A\), then the peak value of current is:

1 \(\frac{{20}}{{\sqrt 2 }}A\)
2 \(\frac{5}{{\sqrt 2 }}A\)
3 \(20\sqrt 2 A\)
4 \(20\sqrt 2 \)
PHXII07:ALTERNATING CURRENT

356061 The peak value of the alternating current given by \({I=4 \sin \omega t+4 \sin (\omega t+2 \pi / 3)}\) is

1 \({4 \sqrt{2}}\)
2 \({2 \sqrt{2}}\)
3 8
4 4
PHXII07:ALTERNATING CURRENT

356062 If the rms current in a 50 \(Hz\) \(AC\) circuit is 5 \(A\), the value of the current 1/300 seconds after its value becomes zero is

1 \(5\sqrt {3/2} \,{\rm{A}}\)
2 \(5\sqrt 2 \,{\rm{A}}\)
3 \(5/\sqrt 2 \,{\rm{A}}\)
4 \(5/6\,{\rm{A}}\)
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PHXII07:ALTERNATING CURRENT

356059 The frequency of \(ac\) mains in India is

1 \(30\,c/s\,{\mathop{\rm or}\nolimits} \,Hz\)
2 \(50\,c/s\,{\mathop{\rm or}\nolimits} \,Hz\)
3 \(60\,c/s\,{\mathop{\rm or}\nolimits} \,Hz\)
4 \(120\,c/s\,{\mathop{\rm or}\nolimits} \,Hz\)
PHXII07:ALTERNATING CURRENT

356060 If reading of an ammeter is 20\(A\), then the peak value of current is:

1 \(\frac{{20}}{{\sqrt 2 }}A\)
2 \(\frac{5}{{\sqrt 2 }}A\)
3 \(20\sqrt 2 A\)
4 \(20\sqrt 2 \)
PHXII07:ALTERNATING CURRENT

356061 The peak value of the alternating current given by \({I=4 \sin \omega t+4 \sin (\omega t+2 \pi / 3)}\) is

1 \({4 \sqrt{2}}\)
2 \({2 \sqrt{2}}\)
3 8
4 4
PHXII07:ALTERNATING CURRENT

356062 If the rms current in a 50 \(Hz\) \(AC\) circuit is 5 \(A\), the value of the current 1/300 seconds after its value becomes zero is

1 \(5\sqrt {3/2} \,{\rm{A}}\)
2 \(5\sqrt 2 \,{\rm{A}}\)
3 \(5/\sqrt 2 \,{\rm{A}}\)
4 \(5/6\,{\rm{A}}\)
NCERT Exemplar
For More Updates join with Us
PHXII07:ALTERNATING CURRENT

356059 The frequency of \(ac\) mains in India is

1 \(30\,c/s\,{\mathop{\rm or}\nolimits} \,Hz\)
2 \(50\,c/s\,{\mathop{\rm or}\nolimits} \,Hz\)
3 \(60\,c/s\,{\mathop{\rm or}\nolimits} \,Hz\)
4 \(120\,c/s\,{\mathop{\rm or}\nolimits} \,Hz\)
PHXII07:ALTERNATING CURRENT

356060 If reading of an ammeter is 20\(A\), then the peak value of current is:

1 \(\frac{{20}}{{\sqrt 2 }}A\)
2 \(\frac{5}{{\sqrt 2 }}A\)
3 \(20\sqrt 2 A\)
4 \(20\sqrt 2 \)
PHXII07:ALTERNATING CURRENT

356061 The peak value of the alternating current given by \({I=4 \sin \omega t+4 \sin (\omega t+2 \pi / 3)}\) is

1 \({4 \sqrt{2}}\)
2 \({2 \sqrt{2}}\)
3 8
4 4
PHXII07:ALTERNATING CURRENT

356062 If the rms current in a 50 \(Hz\) \(AC\) circuit is 5 \(A\), the value of the current 1/300 seconds after its value becomes zero is

1 \(5\sqrt {3/2} \,{\rm{A}}\)
2 \(5\sqrt 2 \,{\rm{A}}\)
3 \(5/\sqrt 2 \,{\rm{A}}\)
4 \(5/6\,{\rm{A}}\)
NCERT Exemplar