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A wire is bent in the form of a regular pentagon of edge length $a$ . A total of charge $q$ is distributed over it. Find the electric field at the centre of the pentagon.

Important Questions on Electric Charges and Fields

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IMPORTANT

Gamma Question Bank for Engineering Physics>Chapter 15 - Electric Charges and Fields>EXERCISE 1.3>Q 14

A point charge

q

is kept at the centre of a fixed semicircular thread having a uniform charge per unit length

λ

, the radius of the semicircular thread being

R

. The force required to keep the charge stationary is

EASY

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Gamma Question Bank for Engineering Physics>Chapter 15 - Electric Charges and Fields>EXERCISE 1.3>Q 15

In which of the following figures, the direction of electric field at point

P

is different from others?

(λ

and

- λ

represent constant linear charge densities)

EASY

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Gamma Question Bank for Engineering Physics>Chapter 15 - Electric Charges and Fields>EXERCISE 1.3>Q 16

A circular ring carries a charge

Q

, the variation of electric field with distance

x

measured from centre along axis for

x < < R

can be given as

[R \to

Radius of Ring]

EASY

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Gamma Question Bank for Engineering Physics>Chapter 15 - Electric Charges and Fields>EXERCISE 1.3>Q 17

A circular ring carries a charge

Q

, the variation of electric field with distance

x

measured from centre along axis for

x < < R

is given by

E = \frac{k Q x}{R^{3}}

[R \to

Radius of Ring]. The maximum electric field on the axis will be [where

C = \frac{Q}{4 π ε_{0} R^{2}}

]

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Gamma Question Bank for Engineering Physics>Chapter 15 - Electric Charges and Fields>EXERCISE 1.4>Q 18

A region of space contains a constant electric field of magnitude,

1325 N C^{- 1}

. A wire frame forming a square,

0.27 m

on a side, is placed in the region, oriented so that the perpendicular to the plane of the square makes an angle of

48 °

with the field. What is the magnitude of the electric flux through the frame?

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Gamma Question Bank for Engineering Physics>Chapter 15 - Electric Charges and Fields>EXERCISE 1.4>Q 19

A charge $q$ is placed just above the centre of a horizontal circle of radius $r$ , and a hemisphere of this radius is erected about the charge. Compute the electric flux through the closed surface that consists of the hemisphere and the planar circle. Do not use Gauss' law.

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Gamma Question Bank for Engineering Physics>Chapter 15 - Electric Charges and Fields>EXERCISE 1.4>Q 20

Which one of the following is correct regarding order of electric field intensity?
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Gamma Question Bank for Engineering Physics>Chapter 15 - Electric Charges and Fields>EXERCISE 1.4>Q 21

A hemispherical surface of radius $R$ is located in a uniform electric field $E$ , as shown. The flux of electric field through the surface is

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A wire is bent in the form of a regular pentagon of edge length a. A total of charge q is distributed over it. Find the electric field at the centre of the pentagon.

Important Questions on Electric Charges and Fields

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A wire is bent in the form of a regular pentagon of edge length $a$ . A total of charge $q$ is distributed over it. Find the electric field at the centre of the pentagon.