# An electric field of 40 μ vm is induced at a point

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37. An electric field of 4.0 μ V/m is induced at a point 2.0 cm from the axis of a long solenoid (radius = 3.0 cm, 800 turns/m). At what rate is the current in the solenoid changing at this instant? a. 0.50 A/s b. 0.40 A/s c. 0.60 A/s d. 0.70 A/s e. 0.27 A/s 38. A long solenoid has a radius of 2.0 cm and has 700 turns/m. If the current in the solenoid is decreasing at the rate of 8.0 A/s, what is the magnitude of the induced electric field at a point 2.5 cm from the axis of the solenoid? 39. An AC generator consists of 6 turns of wire. Each turn has an area of 0.040 m 2 . The loop rotates in a uniform field ( B = 0.20 T) at a constant frequency of 50 Hz. What is the maximum induced emf? 40. At what frequency should a 200-turn, flat coil of cross sectional area of 300 cm 2 be rotated in a uniform 30-mT magnetic field to have a maximum value of the induced emf equal to 8.0 V?

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200 CHAPTER 31 41. The magnetic flux through a loop perpendicular to a uniform magnetic field will change a. if the loop is replaced by two loops, each of which has half of the area of the original loop. b. if the loop moves at constant velocity while remaining perpendicular to and within the uniform magnetic field. c. if the loop moves at constant velocity in a direction parallel to the axis of the loop while remaining in the uniform magnetic field. d. if the loop is rotated through 180 degrees about an axis through its center and in the plane of the loop. e. in none of the above cases. 42. A current may be induced in a coil by 43. Coil 1, connected to a 100 Ω resistor, sits inside coil 2. Coil 1 is connected to a source of 60 cycle per second AC current. Which statement about coil 2 is correct?
• Spring '11
• Legg
• Physics, Magnetic Field, uniform magnetic field

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