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(Solved): answer 4 1. (10 points) A current produce a magnetic field of magnitude 5T at distance 0.03m fro ...

answer 4

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1. (10 points) A current produce a magnetic field of magnitude at distance from a long, straight wire. What is the distance from the wire with this current where the magnitude of the magnetic field is ? 2. (10 points) An electron is accelerated through from rest and then enters a region where is a uniform 1.7 T magnetic field perpendicularly to it. What is the magnitude of magnetic force on the electron and the radius of the path? 3. (10 points) Flexible circular loop shown in Fig. 1 has a radius, and is in a magnetic field of strength which is perpendicular to the plane. During the time 0.5 s the loop is grasped at points and and stretched until its area is nearly zero. Find the average induced emf in the loop during that time and the current through the loop if its resistance is . 4. ( 10 points). Find the direction of the force on a positive charge for each diagram shown in Fig. 2, where is the velocity of the charge and is the direction of the magnetic field. ( means the vector points inward. means it points outward, toward you.)

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