It is an instrument to detect and measure the strength of small electric current.
Principle:--When a current carrying coil is placed in magnetic field,it is experience a torque.
Construction:-It is consists of a coil bound on a non-magnetic field.The coil is suspended between two poles of a permanent magnet which are concave in shape.the coil is suspended by a phosphur bronze strip and this strip is connected to the terminal T1 of the galvanometer and other end of the coil is connected to hair spring which is connected to terminal T2 .A peace of the soft iron is the placed within the frame of the coil.A concave mirror is attached to the suspension to note the deflection of the coil using length and scale arrangement.
thanx.....very good work imran khan....
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