Consider a metallic pipe with an inner radius of 1cm . If a cylindrical bar magnet of radius ` 0.8 cm` is dropped through the pipe ,it takes more time to come down than it takes for a similar unmagnetised cylindrical iron bar dropped through the metalic pipe. Expain .

A uniform magnetic field of 1.5 T exists in a cylindrical region of radius 10.0 cm, its direction parallel to the axis along east to west. A wire carrying current of 7.0 A in the north to south direction passes through this region. What is the magnitude and direction of the force on the wire. If, the wire intersects the axis .

A uniform magnetic field of 1.5 T exists in a cylindrical region of radius 10.0 cm, its direction parallel to the axis along east to west. A wire carrying current of 7.0 A in the north to south direction passes through this region. What is the magnitude and direction of the force on the wire. If, the wire in the N - S direction is lowered from the axis by a distance of 6.0 cm ?

A uniform magnetic field of 1.5 T exists in a cylindrical region of radius 10.0 cm, its direction parallel to the axis along east to west. A wire carrying current of 7.0 A in the north to south direction passes through this region. What is the magnitude and direction of the force on the wire. If, the wire is turned from N - S to northeast and the northwest direction .

If the end correction of an open pipe is 0.8 cm, then the inner radius of that pipe will be

A metal disc is made tospin at 20 revolutions per second about an axis passing through its centre and normal to its plane.The disc has a radius of 30 cm and spinsin a uniform magnetic field of 0.20 T, which is parallel to the axis of ratation. Calculate :The flux cut per second by a radius of the disc.

A circular coil of radius 8.0 cm and 20 turns is rotated about its vertical diameter with an angular speed of 50 rad s^-1 in a uniform horizontal magnetic field of magnitude 3.0 xx 10^-2 T. Obtain the maximum and average emf induced in the coil. If the coil forms a closed loop of resistance 10 ohm, calculate the maximum value of current in the coil Calculate the average power lose due to the Joule heating .Where does this power come from ?

A metal disc is made tospin at 20 revolutions per second about an axis passing through its centre and normal to its plane.The disc has a radius of 30 cm and spinsin a uniform magnetic field of 0.20 T, which is parallel to the axis of ratation. Calculate: The induced emf in the disc

A metal disc is made tospin at 20 revolutions per second about an axis passing through its centre and normal to its plane.The disc has a radius of 30 cm and spinsin a uniform magnetic field of 0.20 T, which is parallel to the axis of ratation. Calculate :The area swept out per second by the radius of the disc.

The terminal velocity of a water drop of radius 0.01 mm falling through air is 1.12 cm/s. If the density of air is neglected, the coefficient of viscosity of air is [density of water =10^(3) kg//m^(3), g=9.8m//s^(2)]