Explain the principle ,working and construction of moving coil galvanometer.
Answers
Answer:
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Explanation:
principle ::when current carrying coil is placed in an uniform electric field it experiences a torque
construction ::
It consits of a rectangular coil of fine insulated copper wire wounded on a light Al frame
A motion of coil is controlled by the pair of heir springs of phosphorous and bronze
The springs experiences a restoring torque and can serve as current leads
A light Al pointer is attached to the coil to measure its deflection on a suitable scale
A symmentrical coil is placed between the concave poles of horshoe permanent magnets
There is a symmentrical soft iron core which not only makes the coil radial but also increases the magnetic strength
WORKING:::
when coil is placed in a magnetic field it experiences a torque
so,
T=F*perpendicular distance
T=NIBb*sin90
T=NIB(ab)
T=NIBA
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