If a stationary bar magnet is placed near a coil so that maximum lines of force pass through the coil, the galvanometer shows:
Correct answer: C. No current
- A. Maximum current
- B. Minimum current
- C. No current
- D. Intermediate value of current
Explanation
When the magnet is stationary and its magnetic field is not changing, there will be no induced electromotive force (EMF) and therefore no induced current in the coil. The galvanometer will show no current.For induced current to flow, there must be a changing magnetic field. If you were to move the magnet relative to the coil, such as by sliding it back and forth, or rotating it, the magnetic field passing through the coil would change, and this changing magnetic field would induce an EMF and a corresponding induced current in the coil. The magnitude of the induced current would depend on factors such as the rate of change of the magnetic field and the properties of the coil.
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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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