How can a magnetic field be produced?
Correct answer: D. Using a permanent magnet or electric current
- A. Using a permanent magnet
- B. Electric current
- C. Using a temporary magnet
- D. Using a permanent magnet or electric current
Explanation
If an electric current is passed through a long coil of wire (a solenoid ) a magnetic field is produced which is the same shape as that of a bar magnet.If we place a positive monopole close to the north pole of a bar magnet, and a negative monopole of the same magnitude close to the south pole, then the resultant magnetic field pattern is obtained by superposing the fields generated by the two monopoles individually.
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About Electromagnetism
Magnetic flux density and magnetic flux describe the strength of a magnetic field and the field passing through a surface. A charged particle moving through a magnetic field experiences a force perpendicular to its velocity and may follow circular or helical motion, depending on the angle between velocity and field.
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