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Electric flux will be maximum if the angle between the field lines and area vector is ______

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in Physics – Class 12 by (135k points)
Electric flux will be maximum if the angle between the field lines and area vector is ______

(a) 45 degree

(b) 135 degree

(c) 90 degree

(d) 0 degree

This question was posed to me during an interview.

My question comes from Electric Flux topic in chapter Charges and Fields of Physics – Class 12

1 Answer

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Best answer
Right option is (d) 0 degree

Easiest explanation: We know that the electric field and area both are vector quantity and the electric flux is expressed as \(\vec{E}.\vec{s}\) (taking dot product). But if the angle between the two vectors is θ then the formula becomes E.s.cosθ.Cosθ will be maximum if theta is zero, in all other cases, the value of Cosθ is less than 1. Therefore flux will be the maximum if the angle is 0 degrees.

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