Electronics and Communication Engineering - Exam Questions Papers - Discussion

Discussion Forum : Exam Questions Papers - Exam Paper 11 (Q.No. 37)
37.
Consider an incremental vector element of length ΔL and angle between an electric field E and ΔL s cos θ.

Then in which direction should ΔL be placed to be obtain maximum value of Δv?
In the direction of E
In opposite direction of E
In the angle of 45° with E
In the angle of 60° with E
Answer: Option
Explanation:

Now E is a definite value at the point which it is present and is independent of direction of ΔL.

The magnitude of ΔL is constant and direction is along the unit vector.

Maximum value of Δv will occur at cos θ = - 1 or ΔL points in opposite direction to E.

Discussion:
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