Advertisements
Advertisements
Question
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?
Advertisements
Solution
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
RELATED QUESTIONS
Name some sources of direct current.
The essential difference between an AC generator and a DC generator is that
What type of generator is used at Power Stations?
An electric generator converts:
(a) electrical energy into mechanical energy.
(b) mechanical energy into heat energy.
(c) electrical energy into chemical energy.
(d) mechanical energy into electrical energy.
A d.c. generator is based on the principle of:
(a) electrochemical induction
(b) electromagnetic induction
(c) magnetic effect of current
(d) heating effect of current
The frequency of alternating current (a.c.) supply in India is:
(a) 0 Hz
(b) 50 Hz
(c) 60 Hz
(d) 100 Hz
Draw a labelled diagram of a simple a.c. generator.
Suggest two ways in an a.c. generator to produce a higher e.m.f.
What energy conversion does take place in a generator when it is in use?
A device for producing electric current is ______.
