A vertical iron pillar is magnetised in a few years if it is partially pit underground. In the northern hemisphere, what would be the polarity at its top?

The mass of a magnetic needle is 7.5 g and its magnetic moment is 98 units . To keep the magnetic needle horizontal in the northern hemisphere , what should be the position of its fulcrum with respect to its Centre of gravity ? Vertical component of earth's magnetic field = 0.25 Oe .

State with reason what will be the nature of polarity at the top of a vertical iron rod grounded partially at a place in the southern hemisphere of earth.

The capacitance of a parallel plate air capacitor is C. Now, half the areas of its plates are vertically dipped in an oil of dielectric constant 1.6. What would be its capacitance?

A wire is kept horizontally at a place in the northern hemisphere of the earth . In what direction will force act on the wire due to the vertical component of the earth's magnetic field , if electric current flows through the wire from south to north ?

A wire of length 2m and diameter 2cm is suspended vertically with its top end fixed. Its poisson's ratio and Young's modulus are 0.2 and 1.8 times 10^11 N.m^-2 respectively.What will be its lateral strain if a load of 1000kg is suspended at its lower end ?