Physics 133
Problem Set #6
Problem#1 In the circuit shown, what current does the ammeter read? Complete explanation
required.
Problem#2 What is the current through resistor R1 in this circuit? What is the power of resistor
R1? What is the power of
Chapter 24
3. (a) The change in energy of the transferred charge is
U = q V = (30 C)(1.0 109 V) = 3.0 1010 J.
2
(b) If all this energy is used to accelerate a 1000-kg car from rest, then U =K = 1 mv ,
2
and we find the cars final speed to be
v=
2K
2U
2(3.
Chapter 25
3. THINK The capacitance of a parallel-plate capacitor is given by C = 0A/d, where A is
the area of each plate and d is the plate separation.
EXPRESS Since the plates are circular, the plate area is A = R2, where R is the radius of
a plate. The
Chapter 26
2. Suppose the charge on the sphere increases by q in time t. Then, in that time its
potential increases by
q
V =
,
4pe 0 r
where r is the radius of the sphere. This means q =4pe 0 r V . Now, q = (iin iout) t,
where iin is the current entering