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When we consider a point charge q moving with a velocity vecv at a given time in presence of magnetic field vecB, the charged particle experiences a magnetic force vecF_m = q[vecv xx vecB]. The force was first given by H.A. Lorentz and is called the Lorentz magnetic force. The force depends on q, vecv and vecB and involves a vector product of vecv and vecB. The force acts in a side ways direction perpendicular to both the velocity and magnetic field and the direction is given by right hand thumb rule for vector product. Obviously force on a negative charge is opposite to that on a positive charge. An electron enters a given region moving with an initial velocity vecv = 12.5 hati m s^(-1) where a unifomr magnetic field vecB = B_0 hatj is also applied. What is the direction of force experienced by electron due to the magnetic field? |
| Answer» Solution :As per RIGHT HAND thumb RULEOF vector product FORCE is along -ve direction of z-axis. | |