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State whether the following statements are true or false:
$(i)$. A cylindrical magnet has only one pole.
$(ii)$. Artificial magnets were discovered in Greece.
$(iii)$. Similar poles of a magnet repel each other.
$(iv)$. Maximum iron filings stick in the middle of a bar magnet when it is brought near them.
$(v)$. Bar magnets always point towards North-South direction.
$(vi)$. A compass can be used to find East-West direction at any place.
$(vii)$. Rubber is a magnetic material.
$(i)$. A cylindrical magnet has only one pole.
[False]
Because every magnet has two poles named as north pole and the south pole.
$(ii)$. Artificial magnets were discovered in Greece.
[False]
The only natural magnet was discovered in Greece. Sturgeon, an English physicist invented the electromagnet in 1824. This electromagnet was made of 18 turns of bare copper wire.
$(iii)$. Similar poles of a magnet repel each other. [True]
$(iv)$. Maximum iron filings stick in the middle of a bar magnet when it is brought near them.
[False]
A magnet bar contains maximum magnetic strength near its ends, so iron filing must have been stuck near its ends.
$(v)$. Bar magnets always point towards North-South direction.
[True]
When a bar magnet is suspended freely, it always points towards North-South direction.
$(vi)$. A compass can be used to find East-West direction at any place.
[True]
A compass determines the North-South direction. Once North-South direction is found, then it is very easy to find East-West direction at any place.
$(vii)$. Rubber is a magnetic material.
[False]
As rubber does not get attracted by a magnet, so it is a non-magnetic material.
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- North pole of a magnet can be identified by$(a)$. Another magnet having its poles marked as North pole and South pole.$(b)$. Another magnet no matter whether the poles are marked or not.$(c)$. Using an iron bar.$(d)$. Using iron filings.
- Fill in the blanks in the following$(i)$. Artificial magnets are made in different shapes such as __________, __________ and ____________.$(ii)$. The Materials which are attracted towards a magnet are called________.$(iii)$. Paper is not a ______ material.$(iv)$. In olden days, sailors used to find direction by suspending a piece of ___________.$(v)$. A magnet always has __________ poles.
- Fill in the blanks.$(i)$. When a bar magnet is broken; each of the broken part will have _________ pole/poles.$(ii)$. In a bar magnet, magnetic attraction is _____ near its ends.
- (a) Define magnetic field lines. Describe an activity to draw a magnetic field line outside a bar magnet from one pole to another pole.(b) Explain why a freely suspended magnet always points in the north-south direction.
- 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. Describe some salient features of magnetic lines of field concept.
- Why does a compass needle get deflected when brought near a bar magnet?
- A plotting compass is placed near the south pole of a bar magnet. The pointer of plotting compass will:(a) point away from the south pole(b) point parallel to the south pole(c) point towards the south pole(d) point at right angles to the south pole
- A bar magnet is immersed in a heap of iron filings and pulled out. The amount of iron filing clinging to the$(a)$. North pole is almost equal to the south pole.$(b)$. North pole is much more than the south pole.$(c)$. North pole is much less than the south pole.$(d)$. Magnet will be same all along its length.
- In a bar magnet, magnetic attraction is ......... near its end.
- Select the correct option1. The magnetic strength of a magnet a. is uniform throughout the body of the magnet b. is concentrated at one point called the pole of the magnet c. is concentrated in two regions called the poles of the magnet d. is concentrated in the centre of the magnet2. Which of the following is not a magnetic material? a. Gold b. Nickel c. Iron d. Cobalt3. Materials attracted by a magnet are called a. diamagnetic b. leading stone c. magnetic materials d. non-magnetic materials4. A compass is used for a. alignment along north-south direction b. to find direction in the sea c. to attract magnetic materials d. none of these
- The north pole of earth’s magnet is in the:(a) geographical south (b) geographical east (c) geographical west (d) geographical north
- To demagnetise a magnet using the heating method. Which of the following is the correct step?(A) Heat the magnet to become red hot and allow it to cool in the east-west direction. (B) Heat the magnet to become red hot, and allow it to cool in the north-south direction(C) Heat the magnet in boiling water and allow it to cool in the north - south direction (D) Both A and B
- Where are poles of a bar magnet located?
- A bar magnet has no markings to indicate its poles. How would you find out near which end is its north pole is located?
- 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.
