- A charge of 10.0 nC is distributed between two small spheres. The distance between the spheres is 30 mm. The electrostatic force between the spheres is
0.100 mN. Find magnitudes of the charges.
- Two capacitors are connected in series, their equivalent capacitance is 2.2 nF. One of the capacitors has a capacitance of 2.6 nF. The charge of the system
is 260 nC. a) Find capacitance of the second capacitor. b) Find voltages across the first and the second capacitor.
- Electric current i in a wire (measured in amperes) depends on time t as i = 2 + 4t. Find the charge that passes across the wire from t = 2 s to t = 4 s.
Find the average current.
- Electron and proton having the same kinetic energy enter a region with homogeneous magnetic field perpendicular to the velocity vector of the particles.
Compare rotational radii of the two particles. Ignore the interaction between them.
Sample Solution