Electromagnetic Theory (CSIR Physical Sciences): Questions 17  20 of 57
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Question number: 17
» Electromagnetic Theory » Electrostatics: Gauss's Law and Its Applications
Appeared in Year: 2011
Question
Four equal point charges are kept fixed at the four vertices of a square. How many neutral points i. e. , points where the electric field vanishes will be found inside the square? (December)
Choices
Choice (4)  Response  

a.  4 

b.  3 

c.  7 

d.  5 

Question number: 18
» Electromagnetic Theory » Gauss Law and Applications
Appeared in Year: 2011
Question
A static charge distribution gives rise to an electric field of the form , where and R are positive constants. The charge contained within a sphere of radius R, centered at the origin is: (December)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 19
» Electromagnetic Theory » Gauss Law and Applications
Appeared in Year: 2014
Question
A solid of radius R has a charge density, given by ; where is the radial coordinate and and R are positive constants. If the magnitude of the electric field at is times that at then the value of a is – (December)
Choices
Choice (4)  Response  

a.  2 

b. 


c.  1 

d. 


Question number: 20
» Electromagnetic Theory » Magnetostatics » Ampere's Theorem
Appeared in Year: 2013
Question
A horizontal metal disc rotates about the vertical axis in a uniform magnetic field pointing up as shown in the figure. A circuit is made by connecting one end A of a resistor to the centre of the disc and the other end B to its edge through a sliding contact S. The current that flows through the resistor is – (December)
Choices
Choice (4)  Response  

a.  DC from A to B 

b.  Zero 

c.  DC from B to A 

d.  AC 
