75. A uniform spherical charge distribution has radius R.. Which of the following is true of the electric field strength due to this charge distribution at a distance r from the center of the charge?
(A) It is greatest when r=0.
(B) It is directly proportional to r when r>R.
(C) It is directly proportional to r when r<R.
(D) It is directly proportional to r2.
(A) It is greatest when r=0.
(B) It is directly proportional to r when r>R.
(C) It is directly proportional to r when r<R.
(D) It is directly proportional to r2.