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7 Cards in this Set
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- Back
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Effect of a ferrous core in a solenoid |
In reality, the magnetic field is much weaker in the case of the solenoid. This can be overcome by placing a ferrous core in the solenoid. This is because the ferrous core has permeability much higher than that of the permeability of free space. As such, the magnetic flux density of the solenoid can be increased substantially by placing a ferrous core (iron rod) inside a solenoid. Furthermore, the ferrous core loses its magnetism when the current in the solenoid is switched off. Solenoid with a core of high permeability are also called electromagnets. |
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Formula to find magnetic force |
F = BILsin@ F - magnetic force exerted on the conductor B - flux density of the magnetic field I - current flowing in the conductor L - length of the conductor (within the field) @ - angle btw the magnetic field and the current |
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Magnetic flux density |
The magnetic flux density B at a point in free space is the force per unit length per unit current when a current carrying conductor is placed there at right angle to the field. |
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Tesla |
One Tesla is the magnetic flux density in which a conductor one metre long and carrying a current of one ampere placed at right angle to the field experiences a force of one newton |
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Formula for magnetic force on a moving charge |
F = BQvsin@ F - magnetic force B - magnetic flux density Q - charge v - velocity of the moving charge @ - angle btw the direction of the moving charge and the field *when @ = 90°, F = BQv *when @ = 0°, F = 0 |
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Magnetic field |
A magnetic field is a region of space which a magnetic force is experienced by a permanent magnet or a current-carrying conductor. |
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Current Balance |
mgy = BILx |
