# Electromagnetic Theory (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 17 - 20 of 68

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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, 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

MCQ▾

### 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

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)

### Choices

Choice (4) Response

a.

DC from A to B

b.

Zero

c.

DC from B to A

d.

AC

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