Two positive point charges q are located on the y-axis at y = ±a. Your answer to part d shows that an electron experiences a linear restoring force, so it will undergo simple harmonic motion. What is the oscillation frequency in GHz for an electron moving between two 1.0 nC charges separated by 2.0 mm?

The electric field inside a 30-cm-long copper wire is 5.0 mV/m. What is the potential difference between the ends of the wire?

During an action potential, Na⁺ ions move into the cell at a rate of about 3 x 10^-7 mol/m²s. How much power must be produced by the “active Na⁺ pumping” system to produce this flow against a +30-mV potential difference? Assume that the axon is 10 cm long and 20 μm in diameter.

The electric potential along the x-axis is V = 100x² V, where x is in meters. What is E_x at (a) x=0 m and (b) x=1 m?