Question

help please 19 and 20

Three charges, 2.00 nC, 3.00 nc and 6.00 nC are arranged at equal distances (0.500m) on the x- and y-axes away from the origin of a rectangular coordinate system as shown in the picture. (InC=10-90) 1 500 Find the electric potential in Volts at point o, the origin of the coordinate system. (Use an approximate value for the Coulomb constant k=9x109 Nm²/C2) Select one: a. 396 V b. 198 v c.99 V O d. 49.5 V Calculate the magnetic field at the center of the current loop of radius R=2.5 cm and infinitely long wire with current I=7.00 A (Hint: Consider the superposition of the fields produced by currents along an infinite wire and a ring) Select one a. 4.64 x 10+1 b. 5.8 x 10-5T c.2.32x10T d. 1.16 x 101

the first exercise is 19 and the second exercise is 20

Answer 1

19) V = k Q1/r1 + kQ2 /r2 + kQ3/r3

V = (9 x 10^9) [ (2 x 10^-9 C / 0.5 m ) + (3 x 10^-9 / 0.5) + (6x 10^-9 / 0.5)

V = 198 V

Ans(b)

20) B = due to straight wire + due to circular loop

B = (u0 I / 2 pi R) + (u0 I / 2 R)

B = (u0 I / 2 R) (1/pi + 1)

B = (4pi x 10^-7 x 7 / 2 (0.025)) (1/pi + 1) = 2.32 x 10^-4 T

Ans(c)