Give some advantages of electromagnets over permanent magnets.
Important Questions on Magnetic Effects Of Electric Current
A student performs an experiment to study the magnetic effect of current around a current carrying straight conductor, he reports that
(i) The direction of deflection of the north pole of a compass needle kept at a given point near the conductor remains unaffected even when the terminals of the battery sending current in the wire are interchanged.
(ii) For a given battery, the degree of deflection of a N-pole decreases when the compass is kept at a point farther away from the conductor.
Which of the above observation is incorrect and why?
A current carrying straight conductor is placed in east-west direction. What will be the direction of the force experienced by this conductor due to earth’s magnetic field? How will this force get affected on reversing the direction of flow of current.
A current carrying straight conductor is placed in east-west direction. What will be the direction of the force experienced by this conductor due to earth’s magnetic field? How will this force get affected on:
Doubling the magnitude of current.
