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Time : Three Hours

1. Answer ail questions, each question carries 1 mark (in a word or phrase) :

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FOURTH SEMESTER B.Sc. DEGREE EXAMINATION, APRIL 2018
(CUCBCSS—UG)
Physics

PHY 4B 04/APY 4B04—ELECTRODYNAMICS_I :

Maximum : 80 Marks

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Give an example of a physical quantity to he quantized.
For a given potential difference docs a capacitor store more or less charge with a dielectric

than it does without a dielectric ?

What is force on surface charge ?

Can two different equipotential surface intersect ?

What is Laplace equation ?

What is bound charge ?

Is there any difference between dielectric constant and dielectric strength ?
Write down the expression for magnetic field of toroidal coil.

What is the use of magnetic vector potential ?

10 Why electrostatic potential is a sealar ?

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۱ (10 x 1 = 10 marks)
Answer ail questions, each question carries 2 marks (Answer in two or three sentences) -

11 Electric charge is quantized, What does this statement mean ?

12 A dipole in a uniform electric field experiences no net force. Is this statement true or fulse ?
Give the reason for your answer. :

13 State two properties of electric field.

14 State mean value theorem. 5

15 State the properties of solutions of Laplace's equation.
16 What is bound currents? _ 1 ५
17 Discuss magnetic field inside matter, :
६ (7 x 2= 14 marks)
Answer any five questions, each question carries 4 marks (Answer in ஐ Paragraph) :

18 Derive the expression for capacitance of a parallel plate capacitor with Partially filled dielectric. *
19 Briefly discuss the method of images.

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