Electricity and Magnetism Answers

Find magnetic field outside the super conductor. Show that the normal component of magnetic field is continuos across the superconductor. Find H outside the superconductor. Find W outside the superconductor so that H=-GRAD W

A charged sphere of mass 2g is freely suspended in an electric field vector 5*100000j N/C.
Calculate the number of excess charged particles in the sphere

The magnetic field midway between two parallel current carrying wires , carrying current I and 2I is B . If the current in the wire with current I is switch off , the magnetic field will become (1) B/3 (2) 2B (3)B/2 (4) B/4

A be am of ion with 2×100000 m/s enters normally into a uniform magnetic field of 4/100 T . If the the specific charge of the ions is 5 ×10000000 C/kg , the radius of the circular path described will be (1) 0.10m (2) 0.16 m. (3) 0.20m (4) 0.25 m.

The earth magnetic induction at a certain points 7/100000 Wb/m×m . This field is to be annulled by magnetic induction at the centre of a circular conducting loop 5.0 cm in radius . The current required is nearly. (1) 5.6 A. (2)56A. (3)2.8 A. (4) 28 A

The magnetic field at the centre due to motion of electron in first Bohr orbit is B . The magnetic field due to motion of electron in second Bohr orbit at the centre will be (1) B/4 (2) B/8 (3) B/32 (4) B/64

An alpha particle and a proton having same momentum enter into a region of uniform magnetic field and move in circular paths . The ratio of the radii of curvature of their path r alpha /r proton in the field is (1) 1/2 (2) 1/4. (3) 1. (4)4

A straight wire of length 0.5 metre and carrying a current of 1.2 ampere is placed in a uniform magnetic field of induction 2 Tesla . The magnetic field is perpendicular to the length of the wire . The force on the wire is (1) 2.4N (2) 1.2 N (3) 3.0N (4) 2.0N

A charged particle enters a uniform magnetic field with velocity vector at an angle of 45° with the magnetic field . The pitch of the helical path followed by the particle is p . The radius of the helix will be (1) p/√2π. (2) √2π (3) p/2π (4) √2p/π

A particle moves in a circle of diameter 0.1cm under the action of a magnetic field of 0.40Tesla . An electric field of 200 V/m makes the path straight . Find the charge /mass ratio of the particle .(1) 2.5 × 100000 C/kg (2)2.5 ×1000000 C/kg (3) 2.5×10000 C/kg (4)2.5×10000000 C/kg