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?
Figure 1:
Prob 2
(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.
Figure 2:
Prob 3
(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?