Electromagnetic Theory (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 46  49 of 68
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Question number: 46
» Electromagnetic Theory » Scalar and Vector Potentials
Appeared in Year: 2012
Question
The vector potential due to a magnetic moment at a point is given by . If is directed along the positive z – axis, the x – component of the magnetic field, at the point , is – (June)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 47
» Electromagnetic Theory » Electrostatics: Gauss's Law and Its Applications
Appeared in Year: 2012
Question
Charges Q, Q and 2Q are placed on the vertices of an equilateral triangle ABC of sides of length , as shown in the figure
The dipole moment of this configuration of charges, irrespective of the choice of origin, is – (June)
Choices
Choice (4)  Response  

a. 


b.  0 

c. 


d. 


Question number: 48
» Electromagnetic Theory » Scalar and Vector Potentials
Appeared in Year: 2012
Question
Consider an infinite conducting sheet in the XY – plane with a time dependent current density , where K is constant. The vector potential at is given by . The magnetic field is –
(December)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 49
» Electromagnetic Theory » Gauss Law and Applications
Appeared in Year: 2012
Question
An infinite solenoid with its axis of symmetry along the z – direction carries a steady current .
The vector potential at a distance from the axis, (December)
Choices
Choice (4)  Response  

a.  Varies as inside and as R outside the solenoid 

b.  Varies as R inside and is constant outside the solenoid 

c.  Is constant inside and varies as R outside the solenoid 

d.  Varies as R inside and as outside the solenoid 
