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प्रश्न
What do you meant by the term pole of a magnet? Magnetically speaking, what is the difference between a piece of brass, a piece of soft iron, and a piece of lode- stone?
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उत्तर
Pole of a magnet: Each end of a bar magnet is called its pole. The point situated slightly inside a bar magnet, where most of its magnetic power is concentrated, is called magnetic pole or pole of a magnet.
Brass is not a magnetic substance and it is not affected by a magnetic field. It does not stick to a magnet.
Soft iron is a ferromagnetic substance and gets strongly attracted to a magnet. Soft iron can not attract other magnetic substances unless gets magnetized.
Lode stone is a naturally magnetized piece of mineral magnetite. It can attract other magnetic substance.
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संबंधित प्रश्न
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Copy the diagram and label theother poles of the magnets.
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[Hint : Iron rod gets magnetised when placed near a bar magnet by magnetic induction, while copper rod does not get magnetised]
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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.
State whether the magnetic field lines in part (a) represent a uniform magnetic field or non-uniform magnetic field?
Answer the following question.
Draw the pattern of magnetic field lines of
(i) a current-carrying solenoid and
(ii) a bar magnet.
List two distinguishing features between the two fields.
A charge of 5000 C flows through an electric circuit in 2 hours and 30 minutes. Calculate the magnitude of current in a circuit.
A battery can supply a charge of 25 × 104 C. If the current is drawn from battery at the rate of 2.5 A, calculate the time in which battery will discharge completely.
A circular loop placed in a plane perpendicular to the plane of paper carries a current when the key is ON. The current as seen from points A and B (in the plane of paper and on the axis of the coil) is anti clockwise and clockwise respectively. The magnetic field lines point from B to A. The N-pole of the resultant magnet is on the face close to
Define magnetic field lines of force.
