A proton enters a magnetic field at the equator is 0.4 gauss, estimate the dipole moment of the earth.

If at a point on the surface of the earth, the horizontal component of the earth's magnetic field is 0.4 gauss and the dip angle is 60^@ , then magnetic field at that point in gauss is

If the horizontal intensity due to the earth's magnetic field is 4 gauss at magnetic equator, then horizontal intensity of magnetic poles is _______. (Fill in the blanks.

A proton of charge +e coulomb enters in a magnetic field of strenth B tesla with speed v , parallel to the direction of magnetic lines of force. what is the force on the proton ?