In the figure provide, a rectangular loop of copper wire is half in and half out

Question

In the figure provide, a rectangular loop of copper wire is half in and half out a magnetic field. If the loop is released and begins to fall, what direction is the net magnetic force on the loop? Note that the magnetic field below the dashed line is zero. Downward There is no net magnetic force on the loop. Upward In the figure provided, a magnetic field is increasing. What is the direction of the current in the loop of wine? Clockwise There is no current in the loop of the wire. Counterclockwise In the figure provided, a bar magnet is pushed upwards toward a conducting loop. Is there are force between the loop and the magnet, and if so, is it attractive or repulsive? There is an attractive force. There is no magnetic force. There is a repulsive force. An LC circuit oscillates at a frequency of 5.50 times 10^3 Hz. What will the frequency be if the inductance is tripled?

Explanation / Answer

question 2)

By Using lenz's law,the induced current always opposes the change of magnetic flux that generated it

so the induced current has to try to decrease the magnetic flux,to satisfy this the field must be outside of the screen ,hence the current prodeces the outside magnetic field is counterclockwise direction

Question 3)

since the induced current produces the magnetic field opposite to the original magnetic field ,hence there exists a repulsive force between loop and bar magnet

so the answer is there is a repulsive force

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