Answer the following questions concerning the direction of induced currents and

Question

Answer the following questions concerning the direction of induced currents and explain your answer, (a) What is the direction of the induced current in resistor R in figure (a) when the bar magnet is moved to the left? (b) What is the direction of the current induced in the resistor R immediately after the switch S in figure (b) is closed? (c) What is the direction of the induced current in R when the current I in figure (c) decreases rapidly to 7.cro? (d) A copper bar is moved to the right while its axis is maintained in a direction perpendicular to a magnetic field as shown in figure (d). If the top of the bar becomes positive relative to the bottom, what is the direction of the magnetic field?

Explanation / Answer

(a) the magnetic field generated by magnet around the wire is from left to right and it's decreasing along the time so the direction of induced current od resistor has to be from left to right to cancel this variation. (b) after closing the switch, a magnetic field produces from right to left. this field increases along the time. so the induced current in resistor should be from left to right to cancel this variation. (c) the direction of magnetic field generated by the current carying wire around the circuit wire is into the page surface. it's a field that decreases along the time. so the induced current in the resistor is from right to left to cancel this variation. (d) the force that acts on the electrons in the magnetic field is upward because positive charges are in top side of the wirw. so according to the right hand rule the magnetic field should be into the page surface to make this force.

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