Current on a circular wire
A current carrying infinitely long wire is kept along the diameter of a circular wire loop, without touching it. The correct statement(s) is(are)
(A) The emf induced in the loop is zero if the current is constant.
(B) The emf induced in the loop is finite if the current is constant.
(C) The emf induced in the loop is zero if the current decreases at a steady rate.
(D) The emf induced in the loop is finite if the current decreases at a steady rate.
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1 solution
OPTION 1 IS OBVIOUSLY RIGHT NOW WE PUT WIRE ABOVE DIAMETER THE ABOUT OF FLUX THAT GOES INSIDE THE PLANE IS SAME AS THE AMOUNT OF THE FLUX THAT IS COMING OUT. HENCE THE INCREMENT OR DECREMENT OF THE CURRENT MAKES NO EFFECT ON THE FLUX
USE RIGHT HAND THUMB RULE TO SEE THE DIRECTION OF THE MAGNETIC FIELD THAT IS ACTING ON LOOP YOU WILL FIND THAT ONE ONE FIELD IS INSIDE THE PLANE WHILE THE OTHER ONE IS COMING OUT OF THE PLANE