Bar Magnet

Q. Inside a bar magnet, in which direction do the magnetic field lines point?

1. North pole to south pole
2. South pole to north pole
3. They don't exist inside the magnet
4. None of the above

Q.

Why do magnets have the tendency to attract metals like iron ?

Q.

Question 1
Why does a compass needle gets deflected when brought near a bar magnet?

Q.

Write four uses of permanent magnets.

Q. What is the difference between a solenoid and a coil?

Q.

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.

Q. Question 14
Two circular coils A and B are placed closed to each other. If the current in the coil A is changed, will some current be induced in the coil B? Give reason.

Q.

Why bar magnets always attract objects made of iron, cobalt and nickel rather than gold, silver?

Q. Soft iron core is used in dc motor and ac generator. Explain ?

Q.

Are Magnets Man-made?

Q.

Explain why ferromagnetic substances are used to make permanent magnets.

Q.

A strong bar magnet is placed vertically above a horizontal wooden board. The magnetic lines of force will be:

(a) only in horizontal plane around the magnet

(b) only in vertical plane around the magnet

(c) in horizontal as well as in vertical planes around the magnet

(d) in all the planes around the magnet

Q.

Each magnet has………. poles.

Q.

The energy change that take place in an electromagnet is

1. Magnetic Energy to Electrical energy

2. Electrical energy to magnetic energy

3. Light energy to magnetic energy

4. Heat energy to magnetic energy

Q.

If a compass is kept exactly between the north poles of a two similar bar magnets, in which direction will the needle get deflected?

1. 4

2. 1

3. 2

4. 3

Q. Question 13 (b)
A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is
(ii) withdrawn from inside the coil?

Q. how does the magnetic compass show its north as the earth's north contradicting the law 'like poles repel and opposite poles repel'.....

Q.

How was lodestone (Magnet) invented ?

Q. Question 13 (a)
A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is
(i) pushed into the coil?

Q.

Name the magnets that keep their magnetism for a long time.

Q.

what are the the chemical changes that take place to an iron bar if magnetised.? what will it's its configuration be? what is exactly happening when a magnet attracts another magnet or iron? do electromagnets have poles?what are exactly magnetic poles?

Q. Magnets like everything are made up of atoms. So why they do behave differently in case of attracting or repelling one another as well as in attracting iron?

Q.

The metallic pointer of a plotting compass gets deflected only when it is placed near a bar magnet because the pointer has :

(a) electromagnetism

(b) permanent magnetism

(c) induced magnetism

(d) ferromagnetism

Q.

When an iron bar is moved over a bar magnet along its length the attractive force

1. increases first and then decreases

2. decreases first and then increases

3. remains same

4. increase

Q.

how exactly does earth act as a big magnet.give me the actual concept

Q. If a bar magnet is brought closer to another bar magnet, it was observed that they repel each other. What are the poles of part 1 and part 2?

1. 1 - South, 2- North
2. 1- North, 2 - South
3. 1 - North, 2- North
4. 1 - South, 2- South

Q.

The three diagrams in the following figure show the lines of force (field lines) between the poles of two magnets. Identify the poles A, B, C, D, E and F.

Q.

Question 1
Why does a compass needle gets deflected when brought near a bar magnet?

Q.

How is temporary magnet different from permanent magnet?

Q.

What are artificial magnets? Draw diagram for magnetic needle.