Suppose you are looking at two current loops in the plane of the page as shown i
ID: 1450030 • Letter: S
Question
Suppose you are looking at two current loops in the plane of the page as shown in the figure. The switch S is closed in the left-hand coil. What is the direction of the induced current in the other loop right after the switch is closed? Why? What is the situation after a very "long" time after the switch is closed? You are pushing the rectangular loop as is shown in the figure below. The magnetic field points into the page. What is the direction is the induced current? Why? What is the direction of the force that you would feel? If you pushed on the loop more vigorously would the force you felt be bigger or smaller? Why? Three particles travel through a region of space where the magnetic field is out of the page, as shown in the figure below. What is the electric charge of each of the three particles, respectively? If one of the particles were a neutron, would its trajectory be 1, 2, or 3?Explanation / Answer
b)
i )
as the loop is pushed into the magnetic field , magnetic flux linked with the loop increases, to oppose the change , the loop induces current in itself to produce magnetic field which oppose the external magnetic field . so loop inducescurrent in counterclockwise direction to have magnetic field in out of the page direction which is opposite to the external magnetic field .
ii)
Using right hand rule , magnetic force direction comes out to be towards left
iii)
as the loop is pushed more vigrously, the rate of change of magnetic flux would be greater and this would produce greater induced current.
F = i BL
clearly , magnetic force depends on magnitude of current,. hence greater current will result in greater magnetic force
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