Question

Tutorial 9: Electricity I (week 10) 1) A typical thunderstorm can be regarded as comprising two charges of +40 C and –40 C, separated in air by a distance of 5 km. Calculate the magnitude of the force between the charges. 2) Four charges are arranged at the corners of a square with sides length, L, as shown. Q= 4 mC, q = 2 mC and L = 10 cm. a) Find the magnitude of the net force on q. b) What is the electric field at this point? 3) In a certain linear accelerator, electrons are emitted from an electron gun into a standing wave accelerator tube that is 0.8 m long. At the end of the tube is an accelerating anode carrying a potential of 20.0 MV. a) Find the speed of an electron when it reaches the end of the tube where it strikes a tungsten target. b) Is this result realistic? 4) A parallel plate capacitor in a radio comprises two strips of aluminium foil with a plate area of 0.75 m², separated by a polyethylene dielectric 2 x 10?? m thick, (?=2.6??). A potential difference of 30 V is applied. Find a) the capacitance b) the charge on each plate c) the electric field in the dielectric d) the stored potential energy

          Tutorial 9: Electricity I (week 10)

1) A typical thunderstorm can be regarded
as comprising two charges of +40 C
and –40 C, separated in air by a
distance of 5 km.
Calculate the magnitude of the force between the charges.

2) Four charges are arranged at the corners of a square
with sides length, L, as shown.
Q= 4 mC, q = 2 mC and L = 10 cm.
a) Find the magnitude of the
net force on q.
b) What is the electric field at
this point?

3) In a certain linear accelerator, electrons are emitted from
an electron gun into a standing wave accelerator tube that
is 0.8 m long. At the end of the tube is an accelerating
anode carrying a potential of 20.0 MV.
a) Find the speed of an electron when it reaches the end
of the tube where it strikes a tungsten target.
b) Is this result realistic?

4) A parallel plate capacitor in a radio comprises two strips of
aluminium foil with a plate area of 0.75 m², separated by a
polyethylene dielectric 2 x 10?? m thick, (?=2.6??). A
potential difference of 30 V is applied. Find
a) the capacitance
b) the charge on each plate
c) the electric field in the dielectric
d) the stored potential energy

Tutorial 9: Electricity I (week 10)

1) A typical thunderstorm can be regarded
as comprising two charges of +40 C
and –40 C, separated in air by a
distance of 5 km.
Calculate the magnitude of the force between the charges.

2) Four charges are arranged at the corners of a square
with sides length, L, as shown.
Q= 4 mC, q = 2 mC and L = 10 cm.
a) Find the magnitude of the
net force on q.
b) What is the electric field at
this point?

3) In a certain linear accelerator, electrons are emitted from
an electron gun into a standing wave accelerator tube that
is 0.8 m long. At the end of the tube is an accelerating
anode carrying a potential of 20.0 MV.
a) Find the speed of an electron when it reaches the end
of the tube where it strikes a tungsten target.
b) Is this result realistic?

4) A parallel plate capacitor in a radio comprises two strips of
aluminium foil with a plate area of 0.75 m², separated by a
polyethylene dielectric 2 x 10?? m thick, (?=2.6??). A
potential difference of 30 V is applied. Find
a) the capacitance
b) the charge on each plate
c) the electric field in the dielectric
d) the stored potential energy

Added by Darren S.

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