Question

Consider a charge $q_1$ on a metallic ball with radius $R_1$ centered on the point O. The ball is inside of a thick, concentric conducting shell with total charge $q_2$. The shell has an inner radius $R_2$ and outer radius $R_3$. The system is in static equilibrium. Find the electric fields at A and at B. The distance between O and A is a and the distance between O and B is b. 1. $E_A = k \frac{q_1}{2a^2}$; $E_B = 0$ 2. $E_A = k \frac{q_1}{R_3^2}$; $E_B = k \frac{q_1}{b^2}$ 3. $E_A = k \frac{q_1 - q_2}{R_2^2}$; $E_B = k \frac{q_1}{b^2}$ 4. $E_A = k \frac{q_1 + q_2}{R_3^2}$; $E_B = 0$ 5. $E_A = 0$; $E_B = k \frac{q_1}{b^2}$ 6. $E_A = k \frac{q_1}{a^2}$; $E_B = 0$ 7. $E_A = k \frac{q_1 - q_2}{2a^2}$; $E_B = 0$ 8. $E_A = k \frac{q_1 + q_2}{a^2}$; $E_B = k \frac{q_1}{b^2}$ 9. $E_A = k \frac{q_1 + q_2}{a^2}$; $E_B = 0$ 10. $E_A = k \frac{q_1 + q_2}{2a^2}$; $E_B = k \frac{q_1}{b^2}$

          Consider a charge $q_1$ on a metallic ball with radius $R_1$ centered on the point O. The ball is inside of a thick, concentric conducting shell with total charge $q_2$. The shell has an inner radius $R_2$ and outer radius $R_3$. The system is in static equilibrium.

Find the electric fields at A and at B. The distance between O and A is a and the distance between O and B is b.

1. $E_A = k \frac{q_1}{2a^2}$; $E_B = 0$
2. $E_A = k \frac{q_1}{R_3^2}$; $E_B = k \frac{q_1}{b^2}$
3. $E_A = k \frac{q_1 - q_2}{R_2^2}$; $E_B = k \frac{q_1}{b^2}$
4. $E_A = k \frac{q_1 + q_2}{R_3^2}$; $E_B = 0$
5. $E_A = 0$; $E_B = k \frac{q_1}{b^2}$
6. $E_A = k \frac{q_1}{a^2}$; $E_B = 0$
7. $E_A = k \frac{q_1 - q_2}{2a^2}$; $E_B = 0$
8. $E_A = k \frac{q_1 + q_2}{a^2}$; $E_B = k \frac{q_1}{b^2}$
9. $E_A = k \frac{q_1 + q_2}{a^2}$; $E_B = 0$
10. $E_A = k \frac{q_1 + q_2}{2a^2}$; $E_B = k \frac{q_1}{b^2}$

consider a charge q1 on a metallic ball with radius r1 centered on the point o the ball is inside of a thick concentric conducting shell with total charge q2 the shell has an inner radius 26208

Added by Lori B.

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