Particle Motion under O Magntic Field:
= q (
If charge is projected
to the Magnetic Field. The path of the charged particle is purely circular and magnetic force povides necessary centripedal force.
R = Radius of the path.
T = Time period of the path.
Otherwise particle moves in a helical path:
Time Period =
Pitch = V11x T =
to magnetic field V11
is velocity 11 to the magnetic field.
Force on a current carrying wire
As F = q(
We can say,
| dF = I( x ) |
Torque on a Current Carrying Loop
Net force on a closed loop is always zero. But there is always a net torque acting on the loop.
= Magnetic Moment
= Magnetic Field.
Let plane of the loop is inclined at an angle 10 -
to magnetic field (
with normal to the plane).
Trque = Bil(sin
= [µ x B]
| U = - .B |
Q1. A rectangular current loop is in an arbitrary orientation is an external magnetic field. Is any work required to rotate the loop about an axis perpendicular to its plane ?
Ans: No, no work is required.
Q2. two wires are II to each other in an external magnetic field with their in same direction. Will they attract or repet ?
Ans: They will attract each other.
Q3. A particle enters a external magnetic field
to it like shown in figure.
In which direction relative to initial air.... will .. leave the field.
Ans: It will complete half circle and leave II to initial direction.