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प्रश्न
A flat coil of wire rotates at a constant speed about an axis perpendicular to a uniform magnetic field. Draw a graph to show how the induced e.m.f. varies relative to the positions of the coil during its one complete rotation. At what position of the coil, the e.m.f. has the maximum value?
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उत्तर
Figure below shows the variation in induced e.m.f. relative to various positions of coil, during its one complete rotation.
The e.m.f. is maximum when the coil is with its plane parallel to the magnetic field.
V = Coil vertical
H = Coil Horizontal
संबंधित प्रश्न
Each one of the following changes will increase emf (or voltage) in a simple generator except:
(a) increasing the number of turns in the armature coil
(b) winding the coil on a soft iron armature
(c) increasing the size of the gap in which the armature turns
(d) increasing the speed of rotation
State whether the following statement are true of false:
A miniature circuit breaker (MCB) works on the heating effect of current.
State one advantage of using a.c. over d.c.
Explain the construction and working of the following. Draw a neat diagram and label it.
Electric Generator (AC)
Explain the difference:
AC generator and DC generator.
Draw a neat labeled diagram of an A.C. generator
What are the number of turns and area specified for the armature coil?
What does the changing flux induce by Faraday's Law?
At which angles does the EMF reach its maximum magnitude?
What voltage range is given as an example for generators in real power stations?
