Are there 2 types of AC current?
A question was asked in our Fa-2 paper that: In AC current, which of the following changes? The options given were:
A. Magnitude only
B. Direction Only
C. Direction and Magnitude both
D. None of these
 
I ticked the C option and i was sure that it was right because i had saw a toppers video on AC current. But, our Science teacher says that there is no magnitude mentioned in our NCERT CBSE textbook, so the correct answer would be B! I was given wrong. She also says that there is 2 types of AC, Static AC and Ideal AC which we use at our houses. Is it True?
Please help me to correct my teacher and please provide enough materials where it is proved that C option is right so that i can show this to my teacher as a proof!
Also, It is true that nothing is given about Magnitude in our textbook but is given in several other reference books, so what should be the answer to the question then?
Pls Help! I need that 1 mark!

Asked by Gourav Barik | 25th Aug, 2014, 07:05: PM

Expert Answer:

The correct option is C.
Firstly the question says what changes for an AC current. Hence, the question does not mention any type.
So, for this reason alone the answer is option C, magnitude and direction both.
 
Secondly, there is no static AC current. The name AC suggests that it is an alternating current. The static current has to be a DC current.
 
 
As you can see from the above diagram, the value of current at points A, B, C, D, E, F, and G is all different.
 
Also the direction (shown by tangential arrows) changes for these points.
 
Hence, AC current is one for which the magnitude as well as the direction of current changes.
So, the correct option has to be C.

Answered by Romal Bhansali | 26th Aug, 2014, 10:20: AM

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