Question

[13] 7. The magnetic field through the conducting square loop at the right changes according to the relation B(t) - 2.5r-6.8t+5 T, where t is in seconds. Each side of the square is 321 cm long and the resistance is 56.8 u. 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 10 A (b) 3.85 x 10 A (t) (c) 9.80 x 10 A. (d) 19.9 x 10 A (e) 36.5 x 10 A. Direction: CCW or CW [14] 8. Circle each of the FALSE statement(s) below. Gauss Law for electrostatics predicts that it is not possible to find an isolated north or an isolated south magnetic pole in nature. (a) (b) Faraday's Law predicts that in a circuit containing an inductor and capacitor and oscillations are taking place, energy is alternately 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, dPE) is an imaginary current that is related to a real changing of an electric field. (D. The displacement current id-6o dt When an electric current exists in an inductor, energy is stored in the magnetic field that surrounds it. (g)

Answer 1

emf is given by 7) B 2.5t-C.8t+5)T A 2 (321x ВА A dB ddt 521x 10m) 5t- C.85.c (521X10)256)-G.8 € 218.49 V - 3.84WoAoptionlb) - 21 8.44 v 56.8 R 3.84xloGA megative sign means curent ig CW