Discussion :: Exam Questions Paper
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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?
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A.
In the direction of E
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B.
In opposite direction of E
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C.
In the angle of 45° with E
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D.
In the angle of 60° with E
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Answer : Option B
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.
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