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MAGNETISM (4. Force on a current-carrying conductor in a uniform magnetic…
MAGNETISM
1. Magnetic field
A region around a magnet where a magnetic force can be experienced
Magnetic flux density, B
2. Magnetic field produced by current-carrying
conductor
The direction of magnetic field around the wire or coil can be determined by using the right hand
grip rule
7. Motion of charged particle in magnetic field and
electric field
Consider a positively charged particle with mass m, charge q and velocity v enters a region of space where the electric and magnetic fields are perpendicular to the particle’s velocity and to each other as shown in figure below.
The charged particle will experiences the electric force FE is downwards with magnitude qE and
the magnetic force FB is upwards with magnitude qvB
If the particle travels in a straight line with a constant velocity hence the electric and magnetic
forces are equal in magnitude
4. Force on a current-carrying conductor in a uniform
magnetic field
5. Forces between two parallel current-carrying
conductors
Consider two identical straight conductors 1 and 2 carrying currents I1 and I2 with length l are
placed parallel to each other
6. Torque on a coil
Maximum torque (Co) = BANI
Torque (C) on the coil = Fa sinθ = BNIba sin θ or:
Torque (C) on the coil = BANI sinθ
3. Force on a moving charged particle in a uniform
magnetic field
Magnetic force
A stationary electric charge in a magnetic field will not experience a magnetic force. But if the charge is moving with a velocity, v in a magnetic field, B then it will experience a magnetic force.
