Relative electrical conductivity and relative magnetic permeability of a substance is $\in_r$ and $\mu_r$ What are the probable values of these quantities for any dimagnetic substance?
A magnet whose magnetic moment is $50 \hat{i} Am ^2$. It is kept in an magnetic field $\vec{B}=(0.5 \hat{i}+3.0 \hat{j}) T$ along the direction of $x$-axis. The torque acting on the magnet is :
A bar magnet of magnetic moment $3.0 A- m ^2$ is kept in an uniform magnetic induction of $2 \times 10^{-5} T$. If each pole of the magnet experiences a force of $6 \times 10^{-4} N$, then length of the magnet is :
A magnetic needle kept parallel to a magnetic field requires a work W to be rotated by 60. The necessary torque required to keep the needle in this position is:
One bar magnet is kept in the direction of north-south such that its north pole is towards north.The direction of points of zero magnetic field is towards which side of the centre of the magnet:
A square current loop is suspended in a uniform magnetic field which is located at its base. If force on one arm of the loop is $\vec{F}$. Then the resultant force on rest three arms is :
Magnetic moment of a thin bar magnet is M. If it is cut first perpendicular to length and then perpendicular to breadth, then magnetic moment of obtained piece is:
Length of a magnetic iron wire is / and its magnetic moment is m. If on moulding it in the form of L, its all arms are of equal sizes, then magnetic moment of new shape will be: