Class 12 NEET Physics Moving Charges and Magnetism

The force experienced by a charged particle moving in space where electric and magnetic field exists is called Lorentz force. When a charged particle carrying charge q is subjected to an electric field of strength

→

E

, it experiences a forcegiven by

→

F

e=q

→

E

whose direction is same as

→

E

or opposite of

→

E

depending on the nature of charge, positive or negative.
If a charged particle is moving in a magnetic field of strength

→

B

with a velocity

→

v

it experiences a force given by

→

F

m=q(

→

v

×

→

B

). The direction of this force is in the direction of

→

v

×

→

B

i.e.perpendicular to the plane containing

→

v

and

→

B

is directed as given by right hand screw rule. Due to both the electric and magnetic fields, the total force experienced by the charge q is given by

→

F

=

→

F

e+

→

F

m =q

→

E

+q(

→

v

×

→

B

)