Question

[6] 2. In the previous problem, how long after switch is closed until the magnetic field is stable? Answer: (a) 1.38 ms. (6) 1.85 ms (c) 2.33 ms. (d) 2.79 ms. (e) 341 ms. (1) - [8] 3. An AC generator is connected to a circuit. The generator's emfis E(0) - 152 V sin(at). If the maximum current that results is 150 mA circuit, -5.01 x 10rad/s and the phase angle is -85.6 degrees, complete the following (0) = sin (af- [8] 4. The amplitude of an alternating current is L -15.2 x 10 Amperes. What is value of Irmı? Answer: (a) 4.46 mA. (6) 8.63 mA. (c) 10.7 mA. (d) 13.6 mA. (e) 18.5 mA. D 145. In a series RLC circuit, the resistance is R 25.4 m2. Ata certain frequency the circuit is in resonance and the value of the inductive reactance at that time is XL is 36.5 m . At that time the capacitive reactance Xe must be Answer: (a), (b) 12.7 m2, (c) 25.4 m2, (d) 36.5 m2, (e) 56.5 m2. (1). [10] 6. Which of the following is (are) TRUE? Circle it (them). (a) A diamagnetic material is attracted to the poles of a magnet. (b) A transformer is a device that can be used to increase or decrease the amplitude of an alternating voltage (c) A paramagnetic material is repelled by the poles of a magnet. (d) A current carrying solenoid is a good example of a magnetic dipole. (e) Magnetic field lines form closed loops. [13) 7. The magnetic field through the conducting square loop at the right changes according to the relation B(t) = 2.50 -6.81 +5 T, wherer is in seconds. Each side of the square is 321 cm long and the resistance is 56.8 2. Determine the current (magnitude and direction) in the loop at t-5.6 seconds? (Hint: For the direction of the current you need determine if the magnetic field is increasing or decreasing with time.) Answer: (a) 1.19 x 106 A. (b) 3.85 x 10A. (c) 9.80 x 106 A. (d) 19.9 x 106 A. (e) 36.5 x 10º A. (1) A. Direction: CCW or CW [14) 8. Circle each of the FALSE statement(s) below. (a) Gauss Law for electrostatics predicts that it is not possible to find an isolated north or an isolated south magnetic pole (b) Faraday's Law predicts that in a circuit containing an inductor and capacitor and oscillations are taking place, energy transferred between the inductor and the capacitor. (C) The North magnetic pole of the earth is somewhere near the northeast of Canada. (d) Gauss' Law for magnetism predicts that an electric field is produced by a changing magnetic flux. (e) Ampere-Maxwell's Law suggests that it is not possible to find isolated electric charges in nature. (f). The displacement current id= " is an imaginary current that is related to a real changing of an electric f (8) When an electric current exists in an inductor, energy is stored in the magnetic field that surrounds it.

Answer 1

4. Imax = 15.2x10 A 10 Max tems = Imax 15-24103 1.414 Irms = 10.7 x 16A Irms = 10.7 mA option (c) 5. R = 25.4 m2, X, = 36.5m3 At resonance Xc = XL TXc= 36.5 ms option (d)]