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Particle Motion under O Magntic Field:
(Secondary Information)
 = 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: Radius = 
Time Period = 
Pitch = V11x T = 
where 
is velocity
to magnetic field V11 is velocity 11 to the magnetic field.
Force on a current carrying wire
: (Secondary Information) As F = q( x
) We can say,
 = dq(
x
) 
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. Given by 
= Magnetic Moment
= Magnetic Field.
Secondary Information
: Let plane of the loop is inclined at an angle 10 - 
to magnetic field (
with normal to the plane). Trque = Bil(sin
)b = B[l(lb)]sin
= [µ x B]
Energy
: dV = 
d
 = µB(cos 1 - cos 2 ) U = -  .B |
Dumb Question
: 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.
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