11. [-/1 Points] DETAILS SERPSE10 30.4.P.021. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Within the green dashed circle shown in the figure below, the magnetic field changes with time according to the expression B = 9.00t - 3.00tz + 0.800, where B is in teslas, t is in seconds, and R = 2.60 cm. Bin (a) When t = 2.00 s, calculate the magnitude of the force exerted on an electron located at point P , which is at a distance r, = 5.20 cm from the center of the circular field region. (b) When t = 2.00 s, calculate the direction of the force exerted on an electron located at point P , which is at a distance 1 = 5.20 cm from the center of the circular field region. O tangent to the electric field line passing through point P, and clockwise O tangent to the electric field line passing through point P, and counterclockwise The magnitude is zero. (c) At what instant is this force equal to zero? (Consider the time after t = 0 s.) Need Help? Read It Submit Answer 12. [-/1 Points] DETAILS SERPSE10 30.5.OP.024. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER In a 280-turn automobile alternator, the magnetic flux in each turn is 1 = 2.50 x 10-4 cos cut, where D is in webers, a is the angular speed of the alternator, and & is in seconds. The alternator is geared to rotate four times for each engine revolution. The engine is running at an angular speed of 1.00 x 10 rev/min. (a) Determine the induced emf in the alternator as a function of time. (Assume & is in V.) 8 = (b) Determine the maximum emf in the alternator. V Need Help? Read It Watch It Submit Answer 13. [-/1 Points] DETAILS SERPSE10 30.A.P.031.MI. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A circular coil enclosing an area of 200 cm is made of 210 turns of copper wire (shown in the figure below). The wire making up the coil has no resistance; the ends of the wire are connected across a 3.00-$ resistor to form a closed circuit. Initially, a 1.60-T uniform magnetic field points perpendicularly upward through the plane of the coil. The direction of the field then reverses so that the final magnetic field has a magnitude of 1.60 T and points downward through the coil. If the time interval required for the field to reverse directions is 0.300 s, what is the average current in the coil during that time? A B Need Help? Read It Master It Submit Answer15. [-/1 Points] DETAILS SERPSE10 30.A.OP.029. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER The circuit in the figure below is located in a magnetic field whose magnitude varies with time according to the expression B = 1.00 x 10 3 t, where B is in teslas and t is in seconds. Assume the resistance per length of the wire is 0.094 0/m. Find the current in section PQ of length a = 69.0 cm. magnitude HA direction ---Select--- P X X X X X X X X X X X X X X X X X a in X * X X X X X X X X X X X X X 2a Q a i Need Help? Read It Watch It Submit