Home
Class 12
PHYSICS
Assertion: Average value of AC over a co...

Assertion: Average value of `AC` over a complete cycle is always zero.
Reason: Average value of `AC` is always defined over half cycle.

A

If both assertion ans reason are true ans reaason is the correct explanation of assertion.

B

If both assertion and reason are true but reason is not the correct explanation of assertion.

C

If assertion istrue but reason is false.

D

If both assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
B
The mean or average value of alternating current or e.m.f. during a half cycle is given by
`I_(m)=0.636 I_(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.
Promotional Banner

Topper's Solved these Questions

  • ALTERNATING CURRENT

    NCERT FINGERTIPS|Exercise NCERT Exemplar|7 Videos

  • ATOMS

    NCERT FINGERTIPS|Exercise Assertion And Reason|15 Videos

Similar Questions

Explore conceptually related problems

The maximum value of A.C. emf in a complete cycle is

The average value of alternating current over a complete cycle is

The average value of cos^2(phi/2) in one cycle is

Average value of KE and PE over entire time period is

Assertion (A) : The average value of lt sin^(2) omega t gt is zero. Reason (R ) : The average value of function F (t) over a period T is lt F (t) gt = (1)/(T) int_(0)^(T) F (t) dt

What is the average value of a.c. over a full cycle ?

These question consists of two statements each linked as Assertion and Reason. While answering these question you are required to choose any one of the following five responses. Assertion: Average value of current in half the cycle an AC circuit can't be zero. Reason: For positive half cycle average value of current is 2/pi i_(0) , where i_(0) is the peak value current. In time interval from t_(1) to t_(2) average value of current will be zero.

The average value for half cycle in a 200 V AC source is

What is the relation between average current and rms current over half cycle.