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

MCQ▾

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

MCQ▾

Question

A static charge distribution gives rise to an electric field of the form E=α(1erR)r^r2 , where α 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.

παε0eR2

b.

αε04π(11e)

c.

4παε0Re

d.

παε0e2R2

Question number: 19

» Electromagnetic Theory » Gauss Law and Applications

Appeared in Year: 2014

MCQ▾

Question

A solid of radius R has a charge density, given by ρ(r)=ρ0(1arR) ; where r is the radial coordinate and ρ0 and R are positive constants. If the magnitude of the electric field at r=R2 is 1.25 times that at r=R, then the value of a is – (December)

Choices

Choice (4) Response

a.

2

b.

14

c.

1

d.

12

Question number: 20

» Electromagnetic Theory » Magnetostatics » Ampere's Theorem

Appeared in Year: 2013

MCQ▾

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)

A rotating horizontal metal disc

A Rotating Horizontal Metal Disc

In figure a horizontal metal disc rotates about the vertical axis in a uniform magnetic field pointing up is shown. 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.

Choices

Choice (4) Response

a.

DC from A to B

b.

Zero

c.

DC from B to A

d.

AC

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