Magnetic force on currents
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Magnetic force on currents
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Fleming’sleft-hand rule
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Magnetic field becomesstronger on the top
Magnetic field becomessmaller at the bottom
Neutral point
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To have greater induced magnetic force:
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Increase current
Stronger magnetic field
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Conducting wire with a permanent magnet
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Attractive force Repulsive force
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AuroraP.63
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The rod moves to LHS.
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The rod moves to RHS.
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No current on metal rod. The rod remains at rest.
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X : North, Y : South
Out of the paper
More magnetic field lines
The force is reversed in direction
No change in direction
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0
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D.c. motor
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A couple is formed
Commutatorrotateswith the coil
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Curren
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Motor can bemore powerful
Use a strongermagnet
Use larger current
Increase number ofturns per unit length of coil
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Use soft-iron core
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x .
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Couple isconstant
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Several coils
Soft-iron core
Large numberof turns of wire
Increase power &run more smoothly
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Loudspeaker
Soundwave
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Solenoid
Paper coneCircularmagnet
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