Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 28

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The electric field at $20 cm$ from the centre of a uniformly charged non-conducting sphere of radius $10 cm$ is $E$ . Then at a distance $5 cm$ from the centre it will be

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Important Questions on Electric Charges and Fields

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 29

If a small sphere of mass

m

and charge

q

is hung from a silk thread at an angle

θ

with the surface of a vertical charged conducting plate, then for equilibrium of sphere, the surface charge density of the plate is

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 30

Two long thin charged rods with charge density

λ

each are placed parallel to each other at a distance

d

apart. The force per unit length exerted on one rod by the other will be

(where k = \frac{1}{4 π ε_{0}})

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 31

Two isolated metallic spheres of radii

2 cm

and

4 cm

are given equal charge, then the ratio of charge density on the surfaces of the spheres will be

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 32

Gauss's law can help in easy calculation of electric field due to

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 33

Each of two large conducting parallel plates has one sided surface area

A

. If one of the plates is given a charge

Q

whereas the other is neutral, then the electric field at a point in between the plates is given by

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 34

If atmospheric electric field is approximately

150 volt m^{- 1}

and radius of the earth is

6400 km,

then the total charge on the earth's surface is

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 35

If

ε_{0}

is permittivity of free space,

e

is charge of proton,

G

is universal gravitational constant and

m_{p}

is mass of a proton then the dimensional formula for

\frac{e^{2}}{4 π ε_{0} G m_{p}^{2}}

is

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 36

Two positive point charges of unequal magnitude are placed at a certain distance apart. A small positive test charge is placed at null point, then