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Direction of magnetic force on a positive charge moving in a magnetic field is given by |
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Answer» Solution :When an electric charge q is moving with velocity `vec(v)` in the magnetic field `vec(B)`, it experiences a force, called magnetic force `vec(F_(m))`. After careful experiments. Lorentz DEDUCED the force experienced by a moving charge in the magnetic field `vec(F_(m))` `vec(F_(m)) = q (vec(v) xx vec(B)) "" `....(1) In MAGNITUDE, `F_(m) = qvB sin theta""` ....(2) In magnitude ,(1) and (2) imply 1.`vec(F_(m))` is directly proportaional to the magnetic field `vec(B)` 2.`vec(F_(m))` is directly proportaional to the velocity `vec(v)` 3.`vec(F_(m))` is directly proportaional to sine of the ANGLE between the velocity and magnetic field 4. `vec(F_(m))` is directly proportaional to the magnitude of the charge q 5. The DIRECTION of `vec(F_(m))` is always perpendicular to`vec(v)` and `vec(b)` as `vec(F_(m))` is the cross product of `vec(v) and vec(B)` 6. the direction of `vec(F_(m))` is on negative charge is opposite to the direction of `vec(F_(m))` on positive charge provided other factors are identical. 7. If velocity `vec(v) ` of the charge q ia along magnetic field `vec(B)` then, `vec(F_(m))` is zero. 
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