Code: A - 14
Subject: ELECTROMAGNETICS AND RADIATION
Time: 3 Hours
Max. Marks: 100
NOTE: There are 11 Questions in all.  
  • Question 1 is compulsory and carries 16 marks. Answer to Q. 1. must be written in the space provided for it in the answer book supplied and nowhere else.
  • Answer any THREE Questions each from Part I and Part II. Each of these questions carries 14 marks.
  • Any required data not explicitly given, may be suitably assumed and stated
Q.1
 Choose the correct or best alternative in the following: (2x8)
a.
A ball having charge 'q' floats in mid air, in presence of a line charge having linear charge density . If the distance of the ball from the charge is 'd' then the mass of the ball is
 
(A)   (B)   
(C)    (D)  
b.
 A positive charged pendulum is oscillating in a uniform electric field (Fig.1).
Its time period as compared to that when it was uncharged :
 
(A) will increase.
(B) will decrease.
(C) will not change.
(D) will first increase and then decrease.

c.
 The equivalent capacitance between A and B (Fig.2) is
(A) 2 C.            (B) 3 C.
(C) 4 C.            (D) .
d.
 An electron moves straight inside a charged parallel plate capacitor of uniform surface charge density (Fig.3). The space between the plates is filled with constant magnetic field of induction . Neglect gravity, the time of straight line motion of the electron in the capacitor is
(A)       (B)   
(C)       (D)   
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