An electric dipole of dipole moment p → is placed in a uniform electrostatic field E → . For what angle between p → and E → will the potential energy of the electric dipole be half of its maximum value?

The potential energy of the dipole is given by the equation, U = − p → . E → = − p E cos θ Here, θ is the angle between the dipole moment ( p ) and the electric field( E ) as shown in figure. U is maximum when cos θ = − 1 and U = + p E ⇒ θ = π

If Coulomb's law involved 1 r 3 dependence (instead of 1 r 2 ), where r is distance between two point changes would Gauss's law still be true?

The dependance of solid angle on radius r is given by d ω = d s cos θ r 2 and not equal to d s cos θ r 3 Solid angle is that angle an arbitrary area makes at a point P. Gauss's law which happens to be an equivalent of Coulomb's law will not hold true if, Coulomb's law involved 1 r 3 dependance instead of 1 r 2 dependance.

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 20

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Figure shows three point charges, $+ 2 q, - q$ and $+ 3 q$ . Two charges $+ 2 q$ and $- q$ are enclosed within a surface $S$ . What is the electric flux due to this configuration through the surface $' S'$ ?

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 21

A metallic sphere is placed in uniform electric field as shown in the figure. Which path is followed by electric field lines and why?

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 22

When two electrically charged particles having charges of different magnitude are placed at a distance

d

from each other, they experience a force of attraction

F

. These two particles are put in contact and again placed at the same distance from each other. What is the nature of new force between them?

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 23

Can a charged body attract an uncharged body?

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 24

An electric dipole of dipole moment

\vec{p}

is placed in a uniform electrostatic field

\vec{E}

. For what angle between

\vec{p}

and

\vec{E}

will the potential energy of the electric dipole be half of its maximum value?

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 25

What is the line of symmetry of a dipole field?

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 26

Find the value of electric field that would exactly balance the weight of electron.

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>Assignment>Q 27

A small test charge is released at rest at a point in an electrostatic field configuration. Will it travel along the field line passing through that point?

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

If Coulomb's law involved