Q1. Two point charges, q1 = -10.0 nC and q2 = +20.0 nC, are 15 cm apart on the x-axis. What is an electric potential at the point on the x-axis where electric field is zero?
Q2. A proton with a kinetic energy of 3.7 × 10-16 J moves perpendicular to a magnetic field of 0.26 T. What is the radius of its circular path?
Q3. The speed of light in a transparent medium (such as glass) is less than the speed of light in a vacuum. Is this a violation of the theory of relativity?