plz tell me in easy words
how does the magnetic lines increase when the straight copper wire is moved away from it
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As the copper wire cuts the magnetic lines of force, the free charges in the wire will experience a force and will get displaced. This displacement of charges in the wire creates a potential difference and hence emf is induced.
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the magnetic field produced by a given current in the conductor decreases as the distance from it increases. From Fig. 13.6, it can be noticed that the concentric circles representing the magnetic field around a current-carrying straight wire become larger and larger as we move away from it.
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