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shailja priya Grade: 12
        in moving coil galvanometer, the coil is wound over the mettalic frame in order to make the galvanometer dead beat i.e. on passing current the galvanometer shows a steady deflection without any oscillation.


what does dead beat mean? how is the use of mettalic frame related to this?
7 years ago

Answers : (1)

SAGAR SINGH - IIT DELHI
879 Points
										

Dear student,


When a current is passed through the coil in the direction PQRS, then the coil experiences a torque


t = NIBA sina


Since the magnified field is radial the plane of the coil is parallel to the magnetic field such that a = 90o and hence t = NIBA.


The coil rotates and the phosphor bronze strip gets twisted. As a result a restoring torque comes into play trying to restore the coil back to original position.


If f be the twist produced in the strip and C be the restoring torque per unit twist then the restoring torque = Cf.


In equilibrium,


 


torque in moving coil galvanometer

 


where G is the galvanometer constant.



 



















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Sagar Singh


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6 years ago
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