List the properties of magnetic lines of force.

2

(a)

Why do not two magnetic lines of force intersect each other?

2

(a)

State Fleming's Left hand Rule.

2

(a)

On what principle does electric motor work?

2

(a)

An electric oven of 2kW power rating is operated in a domestic electric circuit (220 v) that has a current rating of 5 A. What result do you expect ? Explain.

2

(a)

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.

2

(a)

Two circular coils A and B are placed close to each other. If the current in the coil A is changed, will some current be induced in the coil B? Give reason.

2

(a)

What is the function of an earth wire ? Why is its necessary to earth metallic appliances? 

2

(a)

What does the direction of thumb indicate in the right-hand thumb rule? In what way this rule is different from Fleming's left-hand rule?

2

(a)

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

2

(a)

How can the magnitude of the induced current by increased?

2

(a)

Different between electric motor and generator.

2

(a)

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

2

(a)

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

2

(a)

What does a direction of thumb indicate in the right hand thumb rule?

2

(a)