Advertisements
Advertisements
Question
- How would you demonstrate that a momentary current can be obtained by the suitable use of a magnet, a coil of wire and a galvanometer?
- What is the source of energy associated with the current obtained in part (a)?
Advertisements
Solution
-
Move the N-pole of the magnet along the coil, until it reaches the B-end of the coil that is linked to the center zero galvanometer. To indicate that current is flowing in the coil, the pointer deflects to the right. An increase in the rate of current production occurs when the N-pole is moved closer to B, meaning that the coil and magnet are moving relative to one another. No such current is generated and the pointer stays at zero when both are at rest.
-
The source of energy associated with the current obtained in part (a) is mechanical energy.
APPEARS IN
RELATED QUESTIONS
State Lenz’s Law.
- Describe briefly one way producing an induced e.m.f?
- State one factor that determines the magnitude of induced e.m.f. in part (a) above.
- What factor determines the direction of induced e.m.f. in part (a) above?
The direction of induced current is obtained by ______.
An electron moves on a straight line path XY as shown. The abed is a coil adjacent to the path of electron. What will be the direction of current, if any, induced in the coil?
In a coil of resistance 150 `Omega`, a current is induced by changing the magnetic flux through it as shown in the figure. The magnitude of change in flux through the coil is ____________.
The laws of induction were given by ______.
Fleming’s left-hand rule is also known as the dynamo rule.
Define the right-hand thumb rule.
State the use of the principle of electromagnetic induction.
State two factors on which the magnitude of induced e.m.f. in a coil depend.
