tB.S points. 1. Four particles form a square as shown in Fig.1. The length of ea
ID: 3280195 • Letter: T
Question
tB.S points. 1. Four particles form a square as shown in Fig.1. The length of each side is 10 cm. The charges are Q1-2.00 C, Q3= 2.00 C, Q4--2 .00 c. what is the value of Q2 if the net force on Q4 is zero? (Fig. 1). There are two charges on the X-axis as shown in Fig. 2, A-200 C charge is located at-2 cm and another-200 C charge is located at 2 cm, what is the net force on a 1 C test charge located on the Y-axis at 2 cm? Three charges are located on the Y-axis at -2, 0, and 2 cm, as shown in Fig.3. The charges 01 and Q3 are 10 C each, what is the value of Q2 if the net electric field, at point P, is zero? There are two rings, each of radius 10 cm and are separated by a distance of 10 cm, as shown in 2. 3. 4. Fig.4. The centers of the rings are located on the X-axis at -5 cm (ring 1) and 5 cm (ring 2), Ring 1 has a charge of 20 C and ring 2 has a charge of 20 c. what is the electric field on the X-axis at the origin? There is a conducting spherical shell of inner radius 20 cm and outer radius 22 cm. A charge of 20 c is added to the spherical shell, what is the electric field at a distance of (a) 15 cm (b) 21 cm (c) 23 cm and (d) 30 cm from the center of the spherical shell?Explanation / Answer
1] In order to make net force on Q4 zero, we will try to make electric field at Q4 zero, electric field due to q2, cancels that due to q1 and q3,
kQ2/[2 a^2] = kQ1/a^2 cos 45 degree +kQ3/a^2 cos 45 degree
Q2/2 = Q1 cos 45 degree + Q3 cos 45 degree
Q2 = 2*2*cos 45 degree + 2*2* cos 45 degree
= 5.657 uC. answer
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