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Question

In a dead beat galvanometer, the coil is wound on a frame made of:


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Solution

Galvanometer

  1. Galvanometer is an instrument used for measuring current. In a galvanometer, current is detected my the deflection of the needle.
  2. In the galvanometer, a metal piece is placed in a varying magnetic field and the free electrons in the conductor start moving due to the magnetic field and thus giving rise to electric currents known as eddy currents.
  3. The eddy currents travel in a direction opposite to the motion of the conductor in the electric field.

Deadbeat galvanometer

  1. In a galvanometer, due to the rotation of its coil, eddy currents are produced in the metal frame. These eddy currents resist the further movement of the coil. Hence the oscillations stop or are dead, therefore, it is called a deadbeat galvanometer.
  2. The coil of this device is wound on a metal frame because the eddy currents in the metallic frame will bring the oscillation of the coil to rest.

In a deadbeat galvanometer, the coil is wound on a frame made of metal.


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