A magnet is suspended from a spring and it oscillates in and out of a coil placed vertically below it. A galvanometer is connected to the coil and it shows?
Correct answer: D. Deflection to the left and right with decreasing amplitude
- A. No deflection
- B. Deflection on one side only
- C. Deflection to the left and right with constant amplitude
- D. Deflection to the left and right with decreasing amplitude
Explanation
As the magnet oscillates in and out of the coil, it induces an electromotive force (EMF) in the coil due to the changing magnetic flux. This induced EMF causes a current to flow in the coil, which is detected by the galvanometer.The galvanometer will show:- Deflection to the left when the magnet is moving into the coil (increasing magnetic flux)- Deflection to the right when the magnet is moving out of the coil (decreasing magnetic flux)The amplitude of the deflection will decrease over time due to the damping of the oscillations (energy loss due to friction, air resistance, etc.).
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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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