Old Papers
Physics
 |
| AIOU |
ALLMA IQBAL OPEN UNIVERSITY
Level Bachelor Code : 3404 Semester Spring 2011Note: ATTEMPT ANY FIVE QUESTIONS .ALL CARRY
EQUAL MARKS
Questions #1
a) Calculate the electric field due to an electric dipole.
b) A molecule of water vapor causes an electric field in the
surrounding space as if it were an electric dipole like that
of figure below. Its dipole moment has a magnitude
P = 6.2 x 1030cm.what is the magnitude of electric field at a
distance z =1.1 nm from the molecule on its dipole axis?
Question #2 (20)
Discuss Gauss’s Law and apply it on
i) Cylindrical symmetry
ii) Planar symmetry
iii) Spherical symmetry.
Question #3
a) Give a complete account on electric potential energy, calculate
potential due to an electric dipole?
b) The potential at the centre of a uniformly charged circular disk
of radius R = 3.5cm is Vo = 550V.
i) What is the total charge q on the disk?
ii) What is the potential at a point on the axis of the disk at a
distance z = 5 OR from the centre of the disk?
a) Discuss Ohm’s law in detail. Define electric current also.
b) One end of an aluminium wire whose diameter is 2.5mm is
welded to one end of a copper wire whose diameter is 1.88mm.
the composite wire carries a steady current i of 17 mA.
what is the current density in each wire?
a) Calculate the field due to the current interaction of magnetic
field with current.
b) Explain Biot Savart Law.
a) Calculate the magnetic fields of a solenoid .Also calculate the
magnetic field of a toroid.
b) What is thermo electrical seedback?
a) What is Pelter’s and ThomsoB. effeet? Calcu!ate total EMF in
thermocouple.
b) What is Faraday’s law of electromagnetic induction and it's
differential from?
a) Calculate power in alternating current circuits
b) A series RLC circuit driven with £rms = 120V at frequency
fd = 60.0 Hz contains a resistance R=200 Ohm an iinductance with
Xl = 80.0 Ohm and capacitance with Xc = 150 Ohm.
i) What are the power factor cos ф and phase constant ф of the
circuits
ii) What is the average rate Pav at which energy is dissipated
in the resistance.
Old Papers
Physics
|
| AIOU |
ALLMA IQBAL OPEN UNIVERSITY
Level Bachelor Code : 3404 Semester Autum 2011Note: ATTEMPT ANY FIVE QUESTIONS .ALL CARRY
EQUAL MARKS
Q 1. a) Describe Coulomb’s law and its gravitational law. What
are the differences between both laws?
b) A particle of charge -q, is located at the origin of an x-axis
at what location should a second particle of charge -4qi be
placed so that the net electric field of two particles is zero
at x = 3.0mm. [10]
Q2.a) Define and explain the flux of an
electric field. [10] b) A Gaussian surface in the form of a
cylinder of radius R is immersed in a uniform electric
field E. with the Cylinder axis parallel to the field .What
is the flux cp of the electric field through this closed
surface.
Q3.a) Describe scries RLC circuit and derive the expression for
e.m.f. developed across each component and the impedance
of the circuit. C \ b) Define resonance frequency and derive
the expression
Q4. a) Explain the relationship between the current and voltage
b) Write Biot Savarfs Law
Q5. Analyze tlhe travelling electromagnetic wave quantitatively
and qualitatively.
Q 6.
a) Explain the diamagnetic, paramagnetic and fciTOtbagmitic
behavior in matter,
b) Explain hysteresis curve and its practical application.
Q7. Write note on any two of the following.
i) Faraday's law
ii) Mutual Induction
iii) Ampere's law
Q:8
(a) Derive the expression for field build up due to solenoid
and toroid
b) Why magnetization vector "M' lags behind magnetic intensity
vector ‘H’? Expalin.
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