| Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). |
| Mark the correct choice as: |
| Assertion [A]: Average value of AC over a complete cycle is always zero. |
| Reason (R): Average value of AC is always defined over half cycle. |
A) Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A]
B) Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A]
C) Assertion [A] is true but Reason (R) is false
D) Assertion [A] is false and Reason (R) is also false
Correct Answer: B
Solution :
(b) The mean or average value of alternating current or e.m.f. during a half cycle is given by \[{{l}_{m}}=0.636{{l}_{0}}\] or \[{{E}_{m}}=0.636{{E}_{0}}\] During the next half cycle, the mean value of AC will be equal in magnitude but opposite in direction. For this reason the average value of AC over a complete cycle is always zero. So the average value is always defined over a half cycle of AC.
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