1. (2 pts) The figure below shows two conducting rails separated by 0.1m and connected to...

 

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1. (2 pts) The figure below shows two conducting rails separated by 0.1m and connected to a current source (denoted by a circle with an arrow in it). A conducting bar of mass 0.1kg lies on top of the rails, is free to move horizontally along the rails without friction, and completes the electrical circuit. The entire apparatus lies in a magnetic field of 0.2T pointing out of the screen. The current source supplies 0.1A that goes in the direction of the arrow. BO a. What is the magnitude and direction of the force on the bar? b. If the bar starts from rest, how fast will it be moving after 0.1s? c. How far will the bar have moved after 0.1s? 2. (2 pts) An ammeter has a circular coil with 50 turns of wire of diameter 1cm. The axis of the coil is perpendicular to a magnetic field of 0.1T. A current of 10mA passes through the wire. a. What is the force exerted on the coil? b. What is the magnitude and direction of the torque exerted on the coil? (For direction, specify whether the torque is in the direction to make the magnetic field and the coil's magnetic moment parallel or anti-parallel.) c. If the coil rotates by 90 degrees due to the torque, is its magnetic moment now parallel or anti-parallel to the B field? By how much has its potential energy changed? 1. (2 pts) The figure below shows two conducting rails separated by 0.1m and connected to a current source (denoted by a circle with an arrow in it). A conducting bar of mass 0.1kg lies on top of the rails, is free to move horizontally along the rails without friction, and completes the electrical circuit. The entire apparatus lies in a magnetic field of 0.2T pointing out of the screen. The current source supplies 0.1A that goes in the direction of the arrow. BO a. What is the magnitude and direction of the force on the bar? b. If the bar starts from rest, how fast will it be moving after 0.1s? c. How far will the bar have moved after 0.1s? 2. (2 pts) An ammeter has a circular coil with 50 turns of wire of diameter 1cm. The axis of the coil is perpendicular to a magnetic field of 0.1T. A current of 10mA passes through the wire. a. What is the force exerted on the coil? b. What is the magnitude and direction of the torque exerted on the coil? (For direction, specify whether the torque is in the direction to make the magnetic field and the coil's magnetic moment parallel or anti-parallel.) c. If the coil rotates by 90 degrees due to the torque, is its magnetic moment now parallel or anti-parallel to the B field? By how much has its potential energy changed?