Advertisements
Advertisements
प्रश्न
In which of the following case does the electromagnetic induction occur?
A loop of wire is held near a magnet.
Advertisements
उत्तर
No.
संबंधित प्रश्न
State whether the following statement are true or false:
A generator works on the principle of electromagnetic induction.
What do you understand by the term "electromagnetic induction"? Explain with the help of a diagram.
Can a transformer work when it is connected to a D.C. source? Give a reason.
The diagram 10 shows two coils X and Y. The coil X is connected to a battery S and a key K. The coil Y is connected to a galvanometer G.
When the key K is closed. State the polarity
(i)At the end of the coil X,
(ii)At the end C of the coil Y,
(iii)At the end C of the coil Y if the coil Y is (a) Moved towards the coil X, (b) Moved away from the coil X.
The following diagram shows a fixed coil of several turns connected to a center zero galvanometer G and a magnet NS which can move in the direction shown in the diagram.
- Describe the observation in the galvanometer if
- The magnet is moved rapidly,
- The magnet is kept still after it has moved into the coil
- The magnet is then rapidly pulled out the coil.
- How would the observation in (i) of part (a) change if a more powerful magnet is used?
Draw a labelled diagram to make an electromagnet from a soft iron bar. Mark the polarity at its ends in your diagram. What precaution would you observe while making it?
Show that Lenz’s law is in accordance with the law of conservation of energy.
Shown in the figure below is a metre bridge set up with null deflection in the galvanometer. The value of the unknown resistance R is ______
A cylindrical bar magnet is kept along the axis of a circular coil. If the magnet is rotated about its axis, then ____________.
A galvanometer is an instrument that can detect the presence of a current in a circuit.
