Field lines
Explain why electric field lines cannot cross.
Coulomb force
Two +4.0 nC charges are 0.20 m apart. Find F.
Radial field
Find E 0.15 m from +2.0 nC.
Uniform field
A 900 V p.d. is across 1.5 cm. Find E.
Potential
Find V 0.40 m from −3.0 nC.
Energy
An electron moves through 2.5 kV and gains kinetic energy. State the gain.
Gradient
Potential decreases by 120 V over 0.040 m. Find E.
Deflection
Why is the path parabolic between uniform-field plates?