The current entering the positive terminal of a device is (t)=3e-2tma and the voltage across the device is v(t)= 10di/dt v.
(a) find the charge delivered to the device between t=0 and t=2 s.
(b) calculate the power absorbed.
(c) determine the energy absorbed in 3 s.

Atotal charge of –6.50 µc is uniformly distributed within a sphere that has a radius of 0.150 m. what is the magnitude and direction of the electric field at 0.300 m from the surface of the sphere? a) 2.89 × 105 n/c, radially inward b) 6.49 × 105 n/c, radially outward c) 4.69 × 105 n/c, radially inward d) 9.38 × 105 n/c, radially outward e) 1.30 × 106 n/c, radially inward