$PQRS$ is a square loop made of uniform conducting wire the current enters the loop at $P$ and leaves at $S$. Then the magnetic field will be
Maximum at the centre of the loop
Zero at the centre of loop
Zero at all points inside the loop
Zero at all points outside of the loop
Current is flowing through a conducting hollow pipe whose area of cross-section is shown in the figure. The value of magnetic induction will be zero at
Give convection for electric or magnetic field emerging out of the plane of the paper and going into the plane of paper.
For the magnetic field to be maximum due to a small element of current carrying conductor at a point, the angle between the element and the line joining the element to the given point must be.......$^o$
The magnetic field at the centre of a circular current carrying-conductor of radius $r$ is $B_c$. The magnetic field on its axis at a distance $r$ from the centre is $B_a$. The value of $B_c : B_a$ will be :-
A particle carrying a charge equal to $100$ times the charge on an electron is rotating per second in a circular path of radius $0.8$ $metre$. The value of the magnetic field produced at the centre will be $({\mu _0} = $ permeability for vacuum)