# Quiz 6 (PHYS262, Summer 2001)

August 22, 2001

1)
A spherical conducting shell has a radius of and charge of . A point is located inside the shell at a distance from the centre of the sphere, where . What is the electric potential at point ?

(a) (b) (c) (d) (e) Not enough information

2)
In a certain spherically symmetric system, the electric potential as a function of the distance from the centre is shown in Fig. 1. Which of the following statements is FALSE?

(a) The electric field is positive (in the radial direction) between and .

(b) A particle with a positive charge which has a kinetic energy of larger than at will have a kinetic energy of at .

(c) The electric field is zero at and .

(d) A particle with a negative charge located at will be accelerated towards the centre ().

(e) None of the above.

3)
Figure 2 shows a voltage-charge (-) diagram of the process of charging a certain capacitor, from the point to the point . What is the total work required for this process? One unit of voltage and charge is and respectively in the graph.

(a) (b) (c) (d) (e) You cannot determine the work from this diagram alone.

4)
If electrons pass through a resistor in 10 min, what is the potential difference across the resistor?

(a) 21 V (b) 27 V (c) 32 V (d) 37 V (e) 54 V