Question

When is the magnetic flux said to be positive?

(a) θ = 180^o

(b) θ = 360^o

(c) θ = 0^o

(d) θ = 90^o

This question was posed to me during a job interview.

My enquiry is from Electromagnetic Induction in division Electromagnetic Induction of Physics – Class 12

Answer 1

The correct option is (c) θ = 0^o

For explanation I would say: A normal to a plane can be drawn from either side. If the normal drawn to a plane points out in the direction of the field, then θ = 0^o and the flux are taken as positive. If the flux is positive and increasing the voltage will be negative.