52. Compute the electric field at the surface of a) a proton, assuming the proto

Question

52. Compute the electric field at the surface of a) a proton, assuming the proton is a sphere with a radius of 1.2 x 1015 m and q e. b) a lead nucleus, which has a charge of q=+82e, assuming the nucleus is a sphere of radius 7.1 x 10 15 m. 56. Two point charges,-25 C and +50 C, are separated by a distance of 20 cm. What is the electric field (magnitude and direction) at a point halfway between the two charges? 57. For the electric dipole shown below, compute the electric field at the following locations: a) (-15 cm, 0 cm) b) (0 cm, -5 cm) -2.5 nc +2.5 nc (-10 cm, 0 cm) (10 cm, 0 cm)

Explanation / Answer

52.

(a) E = k q / r^2

= (9 x 10^9) (1.6 x 10^-19) / (1.2 x 10^-15)^2

= 1 x 10^21 N/c

(B)

E = (9 x 10^9) (82 x 1.6 x 10^-19) / (7.1 x 10^-15)^2

E = 2.34 x 10^21 N/c

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