Next: Maxwell's Equations [12 marks]
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- 1.
- If
is the acceleration of a small test mass
due to the gravitational attraction of
a large accumulation of other mass,
we can write GAUSS' LAW FOR GRAVITY in the form
,
where
is the total mass inside the
closed surface over which
is integrated.
What is the value of the constant
?
- 2.
- A velocity selector has a magnetic field
perpendicular to an electric field of 20,000 V/m.
We find that charged particles with velocity
m/s
perpendicular to both
and
pass through the device undeflected.
What is the strength of
[in Tesla]?
- 3.
- If
and
are respectively
the permittivity and the permeability of free space,
what is the value [including units] of the quantity
and what does it represent?
- 4.
- An electric dipole,
consisting of a 0.01 C positive electric charge
1 cm away from an equal-magnitude negative charge,
is located at the centre of a sphere of radius 1 m.
What is the average value of the dipole's electric field
normal to the sphere's surface? Explain.
- 5.
- An oscillator consisting of a coil, a capacitor
and a 1000
resistor, all connected in series,
has a resonant frequency of
kHz
and a decay time of
s.
What is the inductance L of the coil?
- 6.
- What is the total relativistic energy of
- (a)
- an electron with a kinetic energy
Ke = 0.511 MeV?
Ee = MeV.
- (b)
- a photon with a momentum of
MeV/c?
MeV.
Next: Maxwell's Equations [12 marks]
Up: Science 1 Physics Final Exam, April 1999
Previous: Science 1 Physics Final Exam, April 1999