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प्रश्न
A magnetic field exerts no force on:
an electrical charge moving perpendicular to its direction
an unmagnetised iron bar
a stationary electric charge
a magnet
उत्तर
a stationary electric charge
Magnetic force is given by Lorentz equation as:
`F=q(VxxB)`
Here, q = amount of electric charge, V = velocity of charge and B= magnetic flux
Thus, when velocity of charge (V)=0 magnetic force (F) = 0
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संबंधित प्रश्न
What are the two ways in which you can trace the magnetic field pattern of a bar magnet?
The strength of the magnetic field between the poles of an electromagnet would be unchanged if:
The wire in Figure below is being moved downwards through the magnetic field so as to produce induced current.
(a) moving the wire at a higher speed?
(b) moving the wire upwards rather than downwards?
(c) using a stronger magnet?
(d) holding the wire still in the magnetic field?
(e) moving the wire parallel to the magnetic field lines?
Explain the mechanism of attraction of iron nails by a magnet when brought near them.
Explain the method of plotting the magnetic field lines by using a small compass needle.
Sketch four magnetic field lines as obtained in a limited space on a horizontal plane in the earth's magnetic field alone.
Define the Isogonic line.
Describe two methods of determining the arrangement of the lines of force in the field close to a bar magnet. Give a brief explanation of each method.
Can two magnetic lines of force intersect? Justify your answer:
A student fixes a white sheet of paper on a drawing board. He places a bar magnet in the centre and sprinkles some iron filings uniformly around the bar magnet. Then he taps gently and observes that iron filings arrange themselves in a certain pattern.
- Why do iron filings arrange themselves in a particular pattern?
- Which physical quantity is indicated by the pattern of field lines around the bar magnet?
- State any two properties of magnetic field lines.
