4. Two point particles, one with charge +8x 10° C and the other with charge-2 x

Question

4. Two point particles, one with charge +8x 10° C and the other with charge-2 x 10-9 C, are separated by 4 m. The electric field midway between them is: A) 13,500 N/C B) 36 x 10 N/C C) 9 x 10°N/C D) 22.5 N/C E) 135,000 N/C s. A 3.5-cm radius hemisphere contains a total charge of 6.6x 10 C. The lux through the rounded portion of the surface is 9.8 x 10' N.m/C. The flux through the flat base is: B) +9.8 x 104 N·m2/C C) -2.3 x 104 N.m?/C D) +2.3 x 104 N m2/C E) -9.8 x 104 N m2/C 6. A particle with a charge of 5.5 x 10 *C is fixed at the origin. A particle with a charge of -2.3 x 10 SC is moved from x 3.5 cm on the x axis to y 4.3 cm on the y axis. The change in potential energy of the two-particle system is: A) 3.1 x 10-3 J B) 0J C) 6.0 x 10- J D) -3.1 x 10-3 J E) -6.0 x 10-5 J

Explanation / Answer

HERE,

4)

charge 1 , q1 = 8 * 10^-9 C

q2 = - 2 * 10^-9 C

r = 4 m

the electric feild at the midpoint , E = K * q1 /(r/2)^2 + K * q2 /(r/2)^2

E = 9 * 10^9 * 8 * 10^-9 /(4/2)^2 + 9 * 10^9 * 2 * 10^-9 /(4/2)^2

E = 22.5 N/C

the electric feild at the midpoint is D) 22.5 N/C

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