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(Solved): answer 4 1. (10 points) A current produce a magnetic field of magnitude 5T at distance 0.03m fro ...
1. (10 points) A current produce a magnetic field of magnitude 5μT at distance 0.03m from a long, straight wire. What is the distance from the wire with this current where the magnitude of the magnetic field is 2μT ? 2. (10 points) An electron is accelerated through 2400V 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, −5cm and is in a magnetic field of strength 0.2T which is perpendicular to the plane. During the time 0.5 s the loop is grasped at points A and B 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 2Ω. 4. ( 10 points). Find the direction of the force on a positive charge for each diagram shown in Fig. 2, where v is the velocity of the charge and B is the direction of the magnetic field. ( ⊗ means the vector points inward. ⊙ means it points outward, toward you.)