Which of the following correctly describes the magnetic field near a long straight wire ?

The phenomenon of electromagnetic induction is 

Choose the incorrect statement from the following regarding magnetic lines of field.

Choose the incorrect statement

The strength of magnetic field inside a long current carrying straight solenoid is 

What is solenoid?

What is meant by overloading.

Distinguish between DC and AC.

Name the device that converts electric energy into mechanical energy.

Under what conditions permanent electromagnet is obtained if a current carrying solenoid is used? Support your answer with the help of a labelled circuit diagram.

Name the factors on which force produced due to magnetic field depends.

Different between electric motor and generator.

What will be the frequency of an alternating current, if its direction changes after every 0.05 s?

A magnetic compass needle is placed in the plane of paper near point A as shown in Figure. In which plane should a straight current carrying conductor be placed so that it passes through A and there is no change in the deflection of the compass? Under what condition is the deflection maximum and why?

Distinguish between permanent magnet and electromagnet.

(a) Why does a magnetic compass needle pointing North and South in the absence of a nearby magnet get deflected when a bar magnet or a current carrying loop is brought near it.
(b) Describe some salient features of magnetic lines of field. 

(a) What is an electromagnet? What does it consist of?
(b) Name one material in each case which is used to make a
(i) Permanent magnet
(ii) Temporary magnet
(c) Describe an activity to show how you can make an electromagnet in your school laboratory.