-5 points An electron moving in the direction of the tx-axis enters a magnetic f

Question

-5 points An electron moving in the direction of the tx-axis enters a magnetic field. If the electron experiences a magnetic deflection in the -y direction, the direction of the magnetic field in this region points in the direction of A) +z-axis. B) -z-axis. C) -x-axis. D) +y-axis. E) -y-axis the 8- 5 points The figure shows four different sets of insulated wires that cross each other at right angles without actually making electrical contact. The magnitude of the current is the same in all the wires, and the directions of current flow are as indicated. For which (if any) configuration will the magnetic field at the center of the square formed by the wires be equal to zero? A) A B) B C) C D) D E) The field is not equal to zero in any of these cases. 9.-5 points The figure shows three long, parallel current-carrying wires. The magnitudes of the currents are equal and their directions are indicated in the figure. Which of the arrows drawn near the wire carrying current I correctly indicates the direction of the magnetic force acting on that wire? 13 A) A B) B C) C D) D E) The magnetic force on current I is equal to zero.

Explanation / Answer

7)
Using Fleming's left hand rule, we place our thumb in the direction of - y-axis, which is the direction of magnetic force, middle finger in the direction of - x-axis, which is the direction of current (eventhough electron is moving in the direction of + x-axis, current is in the direction of - x-axis), we can see that our index finger, which is the direction of magnetic field is pointing in the direction of - z-axis.

8)
Using right hand screw rule, if the currents are in the same direction for two opposite wires, then the magnetic field at the center is zero. So, the correct option is C.

9)
Using right hand screw rule, the magnetic field of the wire I3 is along D and that of I2 is along B. Since I2 is closer to I1, the net magnetic field is along B. Using Fleming's left hand rule, when we align our middle finger out of the page, which is the direction of current, index finger along B, we can see that our thumb is pointing towards A, which is the direction of magnetic force.

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