The force on a north pole, `vec F = m vec B`, is parallel to the field `mvec B`, is parallel to the field `vet B`. Does it contradict our earlier knowledge that a magnetic field can exert forces only perpendicular to itself?

Two bar magnets are placed close to each other with their opposite poles facing each other. In absence of other forces, the magnets are pulled towards each other and their kinetc energy increases. Does it contradict our earlier knowledge that magnetic forces cannot do any work and hence cannot increase kinetic energy of a system?

The net charge in a current carrying wire is zero. Them, why does a magnetic field exert a force on it?

An electric field (vec E) and a magnetic field (vec B)exist in a region . The fields are not perpendicular to each other.

Let vec a , vec ba n d vec c be three units vectors such that 2 vec a+4 vec b+5 vec c=0. Then which of the following statement is true? a. vec a is parallel to vec b b. vec a is perpendicular to vec b c. vec a is neither parallel nor perpendicular to vec b d. none of these

The magnetic flux linked with a coil of N turns of area of cross section A held with its plane parallel to the field B is

Shows a circular wire-loop of radius a m carrying a current I, placed in a perpendicualr matgnetic field B. (a) Consider a small part dl of the wire. Find the force on this part of the wire exerted by the magnetic field. Find the force of compression in the wire.

An angle aob made of a conducting wire moves along its bisector through a magnetic field B as suggested by figure. Find the emf induced between the two free ends if the magnetic field is perpendicular ot the plane of the angle.

Let the magnetic moment of a bar magnet be vec(p_(m)) whose mangetic length is d = 2l and pole strenght is q_(m) . Compute the magnetic moment of the bar magnet when it is cut into two pieces. (a) along its length (b) perpendicular to its length