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What is the effect of breaking a bar magnet?
You get two smaller bar magnets, each with its own north and south pole.
What happens when a compass is placed in a magnetic field?
The compass needle (a tiny dipole) aligns itself with the external magnetic field.
What is the effect of increasing the density of magnetic field lines?
The strength of the magnetic field increases.
What causes magnetic dipoles to arise?
The circular or rotational motion of electric charges (electrons).
What happens when like poles of magnets are brought near each other?
They repel each other.
What happens when opposite poles of magnets are brought near each other?
They attract each other.
What is the effect of breaking a bar magnet in half?
You get two smaller bar magnets, each with its own north and south pole.
What happens when like poles of magnets are brought together?
They repel each other.
What happens when opposite poles of magnets are brought together?
They attract each other.
What is the effect of an external magnetic field on a magnetic compass?
The compass aligns itself with the external magnetic field.
What is the effect of temperature on the permeability of a material?
Permeability can change with temperature.
What is the effect of increasing the density of magnetic field lines?
The strength of the magnetic field increases.
Difference between Biot-Savart Law and Ampère’s Law?
Biot-Savart: Calculates magnetic field from a small current segment, useful for complex geometries. | Ampère’s Law: Relates magnetic field around a closed loop to the enclosed current, useful for symmetrical situations.
Compare the force on a moving charge vs. a current-carrying wire in a magnetic field.
Moving Charge: Force is on a single charge, F = q(v x B). | Current-Carrying Wire: Force is on the entire wire, F = ILBsinθ.