The conductivity of a conductor decreases with temperature because, on heating

Torque required to hold a small circular coil of 10 turns, area of $$2 \times 10^{-4} \mathrm{~m}^2$$ area of carrying 0.5 A current in the middle of a long solenoid of $$10^3$$ turns per metre carrying $$3 \mathrm{~A}$$ current, with its axis perpendicular to the axis of the solenoid is

Two concentric coils each of radius equal to $$4 \pi ~\mathrm{cm}$$ are placed at right angles to each other. If $$10 \mathrm{~A}$$ and $$24 \mathrm{~A}$$ are the currents flowing through the coils respectively, then the magnetic induction at the centre of the coils will be

An AC generator consists of a coil of 100 turns and is of cross-sectional area $$3 \mathrm{~m}^2$$. It is rotating at a constant angular speed of $$60 \mathrm{~rads}^{-1}$$ in a uniform magnetic field of $$0.04 \mathrm{~T}$$. Resistance of the coil is $$360 \Omega$$. What is the maximum power dissipation in the coil?