Question

1. A coil has 400 turns and an area of 0.2 m2. It flips from vertical to horizontal position in a time of 0.7 s in a uniform magnetic field of 3mT. Find the induced emf? 2. How many loops of wire are necessary to give a magnetic field of 3.2x 10-3 T at the center of a circular current loop carrying a current of 15.0 A, if the radius of the loop is 8.00 cm? 3. An electron(q= 1.60217662 x 10-19 coulombs), moving at a speed of 3.00 x 106 m/s, enters a magnetic field of 0.600 T at an angle of 20.0°. Find the force acting on the electron. 4. Calculate the impedance of the following circuit: 0.4 H -0000 5uF 120 V -www. 60 Hz 10 22

Answer 1

Number of turns N = 400 A sea, so = 0.2 m² B Azzo aut Let, field is upwards and 3 mJ - 3x10-3 T. initial flux, := 8.3 = o (as ' and Final flux, pe are perpendiedas B.S BS . in time t = ont sec. in so, Change flux So, induced enshof, 161 = N det de-oi N. os, SEI 400x 3x102 x0.2) o.fi No oda 0.343 volti

2) cursent in loop. I 15.0 A. Required field , B = 3-2 x10-3 T. 8.00 cm 0.08 m. Radius of loop Let N be numbes of so lo NI 2 R 1 on, N = B x2R. Mol 3.2x1013 x 2 x 0.08 li 40x107 x 15.0, on, Na 27.2. oy Nm 27 turns 1