Question

Question 10 5 points Save Answ A square coil (20.0 cm x 20.0 cm) of wire consists of 50 loops. The magnetic field is perpendicular to the face of the coil and increases from 3.0 T to 5.0 T in 0.1 s. The coil is connected across a 20.0 ohm resistor. How much current flows through the resistor? a. 2.0 A b.1.0 A c. 1.5 A d.4.0 A

Answer 1

Solution : - 10: Area of Square Loop 20x20x10+4 400 x10 m² Number of turns, NP Magnetic field increases 50. from 3.0T to 0.1 S. 5.0T in We have, E = N do dt :: 1EL- N dP dt 50 Cent CAD ] dB dt 0 = 0° ] 50 x 5-3 X 400 X 10 40 Volt. Coil is connected across a 20.0 a2 resistor. Current flows through the resistor 40 20 2A I 2 A A coil has Number of turns, Area, A = N 100 0,25 m² B- Magnetic field, 1.5x10 9 wb/m² Time ta 10ms > Induced emf, E = N dd dt N x 2( 8 )/ dt LE 100 X 1.5810 x 0.25 x2 10 X 10 - 3 IE 0.75 Voit

12 A moving rod has length 1 L2 45 x 10 0-2 m. Speed, V = 2 m/s Magnetic field , B = 8.0 T. Induced emf in the rad , &= BLV (8.0) (45 x10-2) (2) a E (63 7.2 Volt