Magnetism Exercise 10a
Please Select
Q1 What is a lodestone?
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Q2 What is a natural magnet? State two limitations of a natural magnet?
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Q3 What is an artificial magnet? State two reasons why do we need artificial magnets?
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Q4 How will you test whether a given rod is made of iron or copper?
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Q5 You are provided with two similar bars, one is a magnet and the other is a soft iron bar. How will you distinguish between them without the use of any other magnet or bar?
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Q6 Fill in the blanks to complete the sentences:
(a) Two ends of a magnet are called ___________.
(b) Unlike poles of a magnet _____________ each other.
(c) Like poles of a magnet _____________ each other.
(d) A freely suspended magnet rests in the geographic ___________ direction
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Q7 A small magnet is suspended by a silk thread from a rigid support such that the magnet can freely swing. How will it rest? Draw a diagram to show it.
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Q8 Explain the term induced magnetism.
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Q9 Explain what do you understand by magnetic induction. What role does it play in attraction of a piece of iron by a magnet?
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Q10 Explain the mechanism of attraction of iron nails by a magnet when brought near them.
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Q11 Explain the following:
(a) When two pins are hung by their heads from the same pole of a magnet, their pointed ends move apart.
(b) Several soft iron pins can cling, one below the other, from the pole of a magnet.
(c) The north end of a freely suspended magnetic needle gets attracted towards a piece of soft iron placed a little distance away from the needle.
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Q12 A small iron bar is kept near the north pole of a bar magnet. How does the iron bar acquire magnetism? Draw a diagram to show the polarity on the iron bar. What will happen if the magnet is removed?
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Q13 'Induced magnetism is temporary'. Comment on this statement.
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Q14 'Induction precedes attraction'. Explain the statement.
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Q15 What do you understand by the term magnetic field lines?
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Q16 State four properties of magnetic field lines.
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Q17 Explain why iron fillings which are sprinkled on a sheet of cardboard placed over a bar magnet, take up a definite pattern when cardboard is slightly tapped.
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Q18 Explain the method of plotting magnetic field lines by using a small compass needle.
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Q19 Can two magnetic field lines intersect each other? Give reason to your answer.
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Q20 In figure below, draw at least two magnetic field lines between the two magnets
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Q21 State two evidences of the existence of earth's magnetic field.
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Q22 Sketch four magnetic field lines as obtained in a limited space on a horizontal plane in the earth's magnetic field alone.
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Q23 (a) Draw the pattern of magnetic field lines near a bar magnet placed with it's north pole pointing towards the geographic north. Indicate the position of neutral points by marking x.
(b) State whether the magnetic field lines in part (a) represent a uniform magnetic field or non-uniform magnetic field?
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Q24 Figure given below shows a bar magnet placed on the table top with it's north pole pointing towards south. The arrow ques shows the north-south direction. There are no other magnets or magnetic material nearby.
(a) Insert two magnetic field lines on either side of the magnet using arrow ques head to show the direction of each field line.
(b) Indicate by crosses, the likely positions of the neutral points.
(c) What is the magnitude of the magnetic field at each neutral point? Give a reason for your answer.
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Q25 What conclusion is drawn regarding the magnetic field at a point if a compass needle at that point rests in any direction? Give reason for your answer.
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Q26 What is a neutral point? How is the position of a neutral point located with the use of a compass needle?
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Q27 State the positions of neutral points when a magnet is placed with it's axis in the magnetic meridian and with it's north pole (i) pointing towards the geographic north, (ii) pointing towards the geographic south.
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Q28 Complete the following sentences:
(a) If the field lines in a magnetic field are parallel and equidistant, the magnetic field is __________ .
(b) At a neutral point, the resultant magnetic field is _____________ .
(c) The neutral points of a bar magnet kept with it's north pole pointing towards geographic north are located ___________ .
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Multiple Choice Questions
Q1 Two like magnetic poles:
(a)repel each other
(b) attract each other
(c) first attract each other, then repel
(d) neither attract nor repel.
Solution :
Q2 In a uniform magnetic field, the field lines are:
(a)curved
(b) parallel and equidistant straight lines
(c) parallel, but non-equispaced straight lines
(d) nothing can be said.
Solution :
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