Construction
of Ballistic Galvanometer
The ballistic galvanometer consists coil of copper wire which is wound on the non-conducting frame of the galvanometer. The phosphorous bronze suspends the coil between the north and south poles of a magnet. For increasing the magnetic flux the iron core places within the coil. The lower portion of the coil connects with the spring. This spring provides the restoring torque to the coil.
When the charge passes through the galvanometer, their
coil starts moving and gets an impulse. The impulse of the coil is proportional
to the charges passes through it. The actual reading of the galvanometer
achieves by using the coil having a high moment of inertia. The moment of
inertia means the body oppose the angular movement. If the coil has a high
moment of inertia, then their oscillations are large. Thus, accurate reading is
obtained.
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