Find the percent increase in magnetic field B when the space within a current-carrying toroid is filled with aluminium. The susceptibility of aluminium is `2.1xx10^-5`.

The space within a current carrying toroid is filled with tungsten of susceptibility 6.8 xx 10^-5 . The percentage increase in the magneticfield is

The strength of the magnetic field at a point r near a long straight current carrying wire is B . The field at a distance r/2 will be

The region inside a current carrying toroid winding is filled with Aluminium having susceptibility x=2.3xx10^-5 . What is the percentage increase in the magnetic field in the presence of Aluminium over that without it?

An aluminium rod and iron rod show 1.5 m difference in their lengths when heated at all temperature. What are their lengths at 0 ^@C if coefficient of linear expansion for aluminium is 24.5 xx 10^-6 //^@C and for iron is 11.9 xx 10^-6 //^@C

An aluminium rod and iron rod show 1.5 m difference in their lengths when heated at all temperature. What are their lengths at 0^@ C if coefficient of linear expansion for aluminium is 24.5 xx 10^(-6) //""^@C and for iron is 11.9 xx 10^(-6) //""^@ C

Derive an expression for force experienced by a current carrying straight wire in a uniform magnetic field B. Discuss when will it be maximum and minimum.

The magnetic field at the centre of a circular current carrying loop of radius 12.3 cm is 6.4 xx 10^-6T . What will be the magnetic moment of the loop? (mu_0 = 4pi xx 10^-7 TmA^-1)

A rectangular coil of effective area 0.01 m^2 suspended freely in a radial magnetic field. The coil deflects through 30^@ when current of 0.5 xx 10^-3 A is passed through it. If torsional constant of suspension is 25 xx 10^-9 Nm//rad . Find 'B' magnetic induction.