Question

13. A metal bar of height 20cm lying in the plane of the page is moved through a magnetic field at a speed of 0.2m/s towards the right (see the figure below). The field has magnitude 0.5T and points out of the page. The charge separation induced in the bar is the same as would be caused by an EMF: a. 0.004 V upward b. 0.0004 V downward c. 0.02 V upward d. 0.02 V downward 0.2 m/s B-0.5T 4. A glass bottom boat allows you to look from air (n-1) under the water (NWATER 1.33) through a pane of glass (nGLASS 1.52). Light at what minimum angle from the vertical coming from the water to the glass will not make it into the air but instead be totally reflected? a. 30 degrees b. 41 degrees c. 49 degrees d. 90 degrees . A light beam in vacuum has a wavelength of 640nm. The frequency of the wave is: a. 2.1 x 1015 Hz b. 0.0052 Hz 2=640 c. 190 Hz d. 4.7 x 1014 Hz A 2mm long wire carries a current of 0.5A directed out of the page. The magnetic field due to this bit of wire at a point P which is 3 meters to the right of and 3 meters lower than the wire (see the figure below) is a. 5.56 x 1012T pointing upwards 45 degrees to the right b. 5.56 x 10-12T pointing downwards 45 degrees to the left c. 3.93 x 10-12T pointing upwards 60 degrees to the right d. 3.93 x 10-12T pointing downwards 30 degrees to the left CwB Зт 0.5A Зт

Answer 1

3.

( Downward)

e = Blu = (0.5 x 0.20 x 0.2) V = 0.02 V

4.

b. 41 degrees

5.

„ V 3 x 108 1 640 x 10-9

V = 4.68 x 1014 Hz

6.

( pointing downwards 45 degrees to the left)

(6) 5.56 x 10-12 T