the working of which of the following devices is based on magnetic effect of electric current
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Cranes use powerful electromagnets to move metallic objects. An electric bell uses electromagnets to produce sound. An induction motor also uses the magnetic effect of current.
Explanation:
The magnetic field lines never intersect each other as an intersection of the field lines means the magnetic field at that point has two directions, which is not possible because the resultant force on a pole (north/south) at any point can only be in one direction.
(i) Magnetic field lines travel from N-pole of the magnet towards 5-pole, outside the magnet, and from S-pole to N-pole inside the magnet.
(ii) The strength of the magnet/magnetic field is given by how close the field lines are if the field lines are closer magnet is stronger.
(iii) No two magnetic field lines ever intersect each other.
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