Question

R 13) Two flat circular plates of radius R are a distance d apart. The bottom plate has a uniform charge +Q and the top plate has a uniform charge - Q. What is the electric field on the top surface of the bottom plate? 20 14) For the plates described in question 13, what is the total electric potential at the bottom surface of the top plate? B 15) A rectangular conducting loop of length / and width w and total resistance Ris being pulled out of a region of magnetic field B. If the loop is moving with a constant speed v, what is the electric current (magnitude and direction) in the loop? W v

i have 15 :)

Answer 1

15 emf &= Bull Ć Current e Ja te R 13 We know electic field due disc E = 20 d UITER² Jd²+ R² so tal field at top of bottom plate E = E + Ez E = 28 + GTIER² UTER² يا راي = T R = 20 UTTER? 2- d Jd²+R² I = 1.25 X0.22 X 8.76 0.34 (I=7.09 If magnetic field outward then current Clockwise If magnetic field inway then current is Counter clockwise 16) E= ICRHY) E = 284,6x16 $wali9 ( 0.075 २ 10.18) Jo.07570.18² E = 4128 NIC (JR +-) 14) fotential V=20 UTTER? V - Vi+ = 20 UITER² (JR² + d²-d :) so Rtr = 20 •UTTER = 30.34 I & Cory TV= - 1534/1G 18 = 5.342 Internal Resistance.