CBSE Class 12science Physics Biot Savart Law
 why the flux of magnetic field over a closed surface always zero?

derivation and expression for the magnetic induction at point dou to strith current carring condoctor
 An electron and a proton having equal momenta enter a uniform magnetic field at right angles to the field lines. What will be the ratio of the radii of curvature of their trajectories?
 State Biot Savart's law for the magnetic field produced at a point due to current element.
 How will you find the direction of the magnetic field produced due to the current element of conductor?
 Find the magnetic field produced by a long straight conductor of length L carrying current I of negligible area of cross section at a point on the conductor itself?
 When will be the magnetic field produced at a point due to current element maximum and minimum?
 Find the magnetic field induction at a point on the axis of a circular coil carrying current.
 Find the magnetic field produced if the point lies at the centre of circular coil carrying current?
 What happens to the magnetic field of the coil on its axis at a point very very far away from its centre, if the radius of the coil is doubled keeping the current flowing through it unchanged?