Give the SI unit of surface integral ∮ S E → ⋅ d S → of an electric field?

Surface integral of an electric field is electric flux and its SI unit is given by SI unit of ϕ E = ∮ E → ⋅ d S → = Nm 2 C − 1

An electric dipole of dipole moment 20 × 10 − 6 C m is enclosed by a closed surface. What is the net flux coming out of the surface?

According to question , P → = 20 × 10 - 6 C From Gaussian law, flux is given by, ϕ = q i n ε o And we know that a dipole have both −ve and +ve charge of equal magnitude. Which implies that the total enclosed charge is given by, q i n = 0 ⇒ ϕ = 0 ε o = 0 &there4; There will be no flux through the surface.

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New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>Text Based Exercises>Q 67

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Give the SI unit of electric flux?

Important Questions on Electric Charges and Field

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New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>Text Based Exercises>Q 68

Give the SI unit of surface integral

[\oint_{S} \vec{E} \cdot \vec{d S}]

of an electric field?

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New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>Text Based Exercises>Q 69

What is the direction of an area vector?

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New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>Text Based Exercises>Q 70

What is a Gaussian surface?

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New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>Text Based Exercises>Q 71

What is the use of Gaussian surface?

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New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>Text Based Exercises>Q 72

How much is the electric flux through a closed surface due to a charge lying outside the closed surface?

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New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>Text Based Exercises>Q 73

Two plane sheets of charge densities $+ σ$ and $- σ$ are kept in air as shown in Fig. 1.161. What are the electric field intensities at points $A$ and $B$ ?

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New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>Text Based Exercises>Q 74

Two small balls, having equal positive charge

q

coulomb are suspended by two insulating strings of equal length

l

metre from a hook fixed to a stand. The whole set up is taken in a satellite into space where there is no gravity. What is the angle between the two strings and the tension in each string?

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New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>Text Based Exercises>Q 75

An electric dipole of dipole moment