Download PTU B.Sc CS-IT 2020 March 1st Sem 70881 Electrodynamics Question Paper

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Roll No. [ [ ]] | [ [ ] Total No. of Pages : 02

Total No. of Questions : 07

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B.Sc.(CS) (2013 & Onwards) (Sem.-1)

ELECTRODYNAMICS

Subject Code : BCS-104

M.Code : 70881

Time : 3 Hrs. Max. Marks : 60

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INSTRUCTIONS TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains SIX questions carrying TEN marks each and students have to attempt any FOUR questions.

SECTION-A

1. Answer briefly :
   1. Define Curl of a vector field. What is its physical significance?

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   2. What do you mean by solenoidal field? Give one example.
   3. Why two electric lines of force do not cross each other?
   4. State Gauss’s divergence theorem.
   5. What is differential form of Gauss’s law?
   6. Differentiate between current and current density.

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   7. What is vector form of Ohm’s law?
   8. Why a charge in motion cannot be measured directly by Coulomb’s law?
   9. What do you understand by conservation of charge?
   10. Show that diamagnetic susceptibility is independent of temperature.

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SECTION-B

1. Derive an expression for the electric field due to an infinitely long uniformly charged straight wire using Coulomb’s law.
2. Using Gauss’s theorem calculate the electric field due to a uniformly charged non-conducting solid sphere at a point :
   1. Outside the sphere and
   2. Inside the sphere.

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3. What is a quadrupole? Prove that electric potential at a point due to quadrupole varies as 1/r³.
4. From the differential form of Gauss's law, develop the Poisson's and Laplace's equation and Laplacian operator.
5. Derive and discuss the equation of continuity ?/?t + ?.J = 0, where J is the current density and ? is the charge density.
6. Find an expression for the field of a point charge moving with uniform velocity. How does it differ from the field due to a stationary charge? Show that the field is not spherically symmetric.

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NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.

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