Question

1. An electron moves in a circular path in the magnetic field of an electromagnet. The plune of the electron's Sicular path is parallel to the smooth vole faces of the electromagnet. In the region where the electron is moving the magnetic field is uniform and has magnitude 0,50 T. The electron moves with a speed of 1.5 x 10 m/s. a. If someone could observe the electron from the north pole of the electromagnet, would the electron inove clockwise or counterclockwise around its circular path? b. Find the radius of the electron's path to the correct number of significant figures. 2. A straight conducting bar that is parallel to the z-axis is placed in the uniform magnetic field B = 2.5i + 1.5j T. The length of the bar i3 0.80 m. a. If there is a current of 1.2 A directed upward in the conducting bar find the magnitude and direction of the force on the bar due to the magnetic field. b. Find the magnitude and direction of the force on the conducting bar if it is parallel to the x-axis and carries a current of the 1.2 A in the +x direction. 3. A circular loop of wire lies in the xy-plane. The radius of the loop is 3.4 cn., it carries a current of 0.80 A that circuates clockwise when viewed from above. a. Find the magnetic dipole moment u of the loop. (Remember that your answer is a vector. Express it in i, j, k notation.). b. If the loop is in the uniform magnetic field B = 1.1iT, find the torque on the loop. (Again express your answer in i, j, k notation.) 4. A semicircular conductor of radius R carries a current i clockwise as shown in Figure 1. Use the Biot-Savart law to find the magnitude and direction of the magnetic field at point P.

Answer 1

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