Which of the following property of a proton can change while it moves freely in a magnetic field ?

The device used for producing electric current is called a 

For a current in a long straight solenoid N- and S- poles are created at the two ends. Among the following statements, the incorrect statement is 

To convert an AC generator into DC generator

A uniform magnetic field exists in the plane of paper pointing from left to right as shown in Figure. In the field an electron and a proton move as shown in the figure. The electron and the proton experience

Distinguish between DC and AC.

Where do we connect a fuse with the live wire or with neutral wire?

What is similar between solenoid and bar magnet?

How is solenoid different from a coil?

What is a compass needle?

List the properties of magnetic lines of force.

What is the role of a split ring in an electric motor ?

How does a solenoid behave like a magnet? Can you determine the north and South poles of a current-carrying solenoid with the help of a bar magnet? Explain.

Name some devices in which electric motors are used .

How will the magnetic field intensity at the centre of a circular coil carrying current change, if the current through the coil is doubled and the radius of the coil is halved?

What is meant by the term, 'magnetic field'?  Why does a compass needle show deflection when brought near a bar magnet?

What are the salient feature of domestic electric wiring?

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

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

(a) Give two uses of electromagnets.
(b) Name any two devices which use permanent magnets.

With the help of a labelled circuit diagram illustrate the pattern of field lines of the magnetic field around a current carrying straight long conducting wire. How is the right hand thumb rule useful to find direction of magnetic field associated with a current carrying conductor?

Describe the activity that shows that a current-carrying conductor experiences a force perpendicular to its length and the external magnetic field. How does Fleming's left-hand rule help us to find the direction of the force acting on the current carrying conductor?

(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.

Explain the phenomenon of electromagnetic induction. Describe an experiment to show that a current is set up in a closed loop when an external magnetic field passing through the loop increases or decreases.