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प्रश्न
If you hold a coil of wire next to a magnet, no current will flow in the coil. What else is needed to induce a current?
उत्तर
A relative motion between the coil of the wire and the magnet is needed to induce current
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संबंधित प्रश्न
The shape of the earth's magnetic field resembles that of an imaginary:
(a) U-shaped magnet
(b) Straight conductor carrying current
(c) Current-carrying circular coil
(d) Bar magnet
Which of the following statements is incorrect regarding magnetic field lines?
(a) The direction of magnetic field at a point is taken to be the direction in which the north pole a magnetic compass needle points.
(b) Magnetic field lines are closed curves.
(c) If magnetic field lines are parallel and equidistant, they represent zero field strength.
(d) Relative strength of magnetic field is shown by the degree of closeness of the field lines.
The figure given below shows the magnetic field between two magnets:
Copy the diagram and label theother poles of the magnets.
Which is the weaker magnet?
Explain why iron filings which are sprinkled on a sheet of cardboard placed over a bar magnet take up a definite pattern when cardboard is slightly tapped.
Figure. shows a bar magnet placed on the table top with its north pole pointing towards south. The arrow shows the north-south direction. There are no other magnets or magnetic materials nearby.
Indicate by crosses, the likely positions of the neutral points.
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.
Which substances are used for making electromagnets?
Select the correct option:
The magnetic strength of a bar magnet is:
A magnetic needle is kept in a non-uniform magnetic field. It experiences ______.
The direction of the magnetic lines around a current-carrying conductor can be easily understood using the ______ rule.
