The electric field produced by a positively charged particle placed in an x y -plane is 7 . 2 ( 4 i ^ + 3 j ^ ) N C - 1 at the point ( 3 cm , 3 cm ) and 100 i ^ N C - 1 at the point ( 2 cm , 0 ) . Select the incorrect option.

The x -coordinate of the charged particle is - 2 cm .

The charged particle is placed on the x -axis.

The charge of the particle is 10 × 10 - 12 C .

The electric potential at the origin due to the charge is 9 V .

Correct the following sentence: 1 MeV = 1 . 6 × 10 - 15 J

Electron volt is a unit of energy. It is represented by eV . 1 eV is defined as the amount of kinetic energy gained by an electron when it accelerates through an electric potential difference of 1 V . 1 eV = 1 . 6 × 10 - 19 J Since this unit is very small, sometimes it is convenient to use mega electron volt. 1 MeV = 10 6 × 1 eV ∴ 1 MeV = 10 6 × 1 . 6 × 10 - 19 J ⇒ 1 MeV = 1 . 6 × 10 - 13 J

EASY

Earn 100

What is One Electron Volt?

Important Questions on Electricity and Magnetism

HARD

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Potential Difference

The electric field produced by a positively charged particle placed in an

x y

-plane is

7.2 (4 \hat{i} + 3 \hat{j}) N C^{- 1}

at the point

(3 cm, 3 cm)

and

(100) \hat{i} N C^{- 1}

at the point

(2 cm, 0)

. Select the incorrect option.

EASY

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Potential Difference

Name the SI unit of time and define it.

MEDIUM

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Potential Difference

It is always important to value time and perform things on a schedule. Discuss.

EASY

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Potential Difference

The electric field at a point due to a point charge is

20 N C^{- 1}

and the electric potential at that point is

10 J C^{- 1}

. Calculate the distance of the point from the charge and the magnitude of the charge.

EASY

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Potential Difference

What is the potential of Earth?

MEDIUM

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Potential Difference

Define the term one second.

HARD

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Potential Difference

Two concentric uniformly charged spheres of radius $10 cm$ and $20 cm$ are arranged as shown in the figure. The potential difference between the spheres is,

Question Image

EASY

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Potential Difference

Write the quadrants in which the following points lie:

$(- 4, 7)$

EASY

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Potential Difference

"The definition of metre based on velocity of light is considered to be absolutely constant" why?

EASY

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Potential Difference

Correct the following sentence:

$1 MeV = 1.6 \times 10^{- 15} J$

EASY

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Potential Difference

Two points

A

and

B

are located in diametrically opposite directions of a point charge of

+ 2 μ C

at distances

2 m

and

1 m

respectively from it. Determine the potential difference

V_{A} - V_{B}

EASY

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Potential Difference

Charges of

+ \frac{10}{3} \times 10^{- 9} C

are placed at each of the four corners of a square of side

8 cm

. The potential at the intersection of the diagonals is

EASY

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Potential Difference

Define one metre in terms of speed of light.

HARD

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Potential Difference

Calculate the potential energy of a point charge

- q

placed along the axis due to a charge

+ Q

uniformly distributed along a ring of radius

a

. Sketch P.E. as a function of axial distance

z

from the centre of the ring. Looking at the graph, can you see what would happen if

- q

is displaced slightly from the center of the ring (along the axis)?

EASY

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Potential Difference

What do you understand by one electron volt ? What kind of physical quantity does it represent-potential difference, charge or energy ? Express electron-volt in ergs. What is the magnitude of the electron-volt in joules ?

EASY

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Potential Difference

What's the difference between electron volt and volt?

EASY

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Potential Difference

Cotyledons are also called-

MEDIUM

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Potential Difference

How is the velocity of light used for determining the standard metre?

EASY

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Potential Difference

The metre is the length of the path travelled by light in glass during a time interval of $\frac{1}{299792458}$ a second.