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Galvanometer:
1. An electromechanical instrument, which is used to detect the presence of current in a circuit is known as galvanometer.
2. The major parts of a galvanometer are following.
a. U-shaped magnet whose north and south poles are made concave
b. Rectangular coil made by winding insulated copper wire on a non magnetic material.
c. A suspended strip to hold the coil.
d. Soft iron core
e. Spiral spring
f. Scale, pointer and a source of light.
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TA=300 TB=400 rA= rA=6.3(10)^12
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