Q40: A magnetic field directed into the page changes with time according to B = 0t 2 + , where B is in teslas and t is in seconds. The field has a circular cross section of radius R = 2.50 cm (see Fig. P31.39). When t = s and r2 = m, what are
(a) the magnitude and
(b) the direction of the electric field at point P2?
pi =
g =