Question

1. The EKG does not filter signals well above the heartbeat rate of about 1Hz, in fact it passes through signals up to 10 Hz. Why allow signals above the heart-rate into the filtered result?

2.Two spheres, spaced 3 cm apart, experience an electrostatic force of repulsion of 10^-19 N. How many excess electrons must be painted on each sphere?

3. Doubling the voltage across a capacitor causes its capacitance C to:

(a) Remain the same

(b) Shrink

(c) Double

Answer 1