Magnetism

Give two essential characteristics of a
material used for preparing an electromagnet.
[Foreign 2004]

How does the (i) pole strength and
(ii) magnetic moment of each part of a bar
magnet change if it is cut into two equal
pieces transverse to its length ? [Delhi 2003]

How does the (i) pole strength and (ii) magnetic
moment of each part of a bar magnet change if
it is cut into two equal pieces along its length ?
[Delhi 2003]

Where on the earth's surface is the value of
angle of dip maximum ? [Delhi 2003]

As shown in the figure, a charged particle enters
a uniform magnetic field and experiences an
upward force as indicated. What is the charge
sign on the particle ? [Delhi 2003C

Which orientation of a magnetic dipole in a
uniform magnetic field will correspond to its
stable equilibrium ?