question_answer 35)

  Consider a closed loop C in a magnetic field, Fig. 4(EP).8. The flux passing through the loop is defined by choosing a surface whose edge coincides with the loop and using the         formula ..... Now if we chose two different surfacesand  having C as their edge, would we get the same answer for flux. Justify your answer.

Answer:

                  We would get the same answer for magnetic flux. This is because magnetic flux = number of magnetic field lines passing through the surface  As magnetic field lines form closed continuous loops and cannot end or start in space, therefore, in Fig. 4(EP).8, number of magnetic lines passing through surface  must be the same as the number of magnetic lines passing through the surface .