Final_Exam_Review_-_Practice_Problems_2013

# If the magnetic field points to the left and the

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if the magnetic field points to the left and the direction of the velocity vector points upward. 6. A magnetic force of 3.72 N points into the page, while a charge experiences a magnetic field of 0.13 T pointing downwards. If the charge moves at 1.6x10 8 m/s, what is the (a) direction that the charge travels in and (b) magnitude of the charge? 7. The voltage across a primary is 120 volts. The secondary carries 5 amps. The power input to the primary is 120 watts. Find the secondary voltage. Is this a step-up or step-down transformer? 8. The AC voltage to the primary of a transformer is 200 V. The primary has 80 turns. The secondary has 320 turns. If the primary current is 1 amp, find the secondary current. Is this a step-up or step-down transformer? 9. A voltage across a primary is 80V and has 300 W of power. The secondary voltage is 120 V. Find the secondary current. Is this a step-up or step-down transformer? 10. A ray of light in air strikes water (n = 1.33) at an angle of 12 o with respect to the perpendicular of the water’s surface. (a) What is the angle of refraction? (b) What is the speed of light in water? 11. A ray of light in fused quartz (n =1.46) strikes salt (n = 1.54) at an angle of 25 o with respect to the perpendicular of the salt’s surface. (a) What is the angle of refraction? (b) What is the speed of light in salt?

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