The force between the poles of two magnets and the force between two charges are alike in that both
Correct answer: A. obey an inverse square law
- A. obey an inverse square law
- B. act only over a few millimetres
- C. are always attractive
- D. require a material medium
Explanation
Both fall off as one over the square of the separation and both can be attractive or repulsive depending on the sign or polarity involved. The essential difference is that an isolated magnetic pole has never been found, whereas an isolated electric charge is ordinary. Cutting a magnet in half simply produces two smaller magnets, each with both poles.
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About Magnetic Flux Density
Magnetic flux density measures the magnetic force acting on a current carrying conductor or moving charge in a magnetic field. Work includes the relations B equals F divided by IL and F equals qvB, the tesla as its SI unit, field direction and the distinction between flux density and magnetic flux.
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