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A conducting shell of radius R carries charge -Q. A point charge +Q is placed at the centre of shell. The electric field E varies with distance r (from the centre of the shell) as

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Important Questions on Electric Charges and Fields

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CUET (UG)
IMPORTANT
Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 122
A conducting spherical shell of radius R has a charge +q units. The electric field due to the shell at a point
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CUET (UG)
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Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 123
A hollow insulated conducting sphere is given a positive charge of 10 μC. What will be the electric field at the centre of the sphere? The radius of the sphere is 2 m.
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CUET (UG)
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Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 118
If the electric flux entering and leaving an enclosed surface respectively are ϕ1 , and ϕ2 , the electric charge inside the surface will be
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CUET (UG)
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Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 119
Flux (in S.I. units) coming out and entering a closed surface is shown in figure. Net charge enclosed by the closed surface is -

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CUET (UG)
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Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 120
The electric charges are distributed in a small volume. The flux of the electric field through a spherical surface of radius 10 cm surrounding the total charge is 20 Vm. The flux over a concentric sphere of radius 20 cm will be
EASY
CUET (UG)
IMPORTANT
Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 121
Assertion: According to Gauss' law, ∮E→.dA→=Σqε0. Here, E→ is the resultant electric field due to all charges present inside as well as outside the closed surface. On the other hand, the charge q, appearing in the law, is only the charge contained within the closed surface.

Reason: Gauss' law is applicable for fields which are conservative and obey inverse square law.
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CUET (UG)
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Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 124
The expression for electric field intensity at a point outside uniformly charged thin plane sheet is ( d is the distance of point from plane sheet)
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CUET (UG)
IMPORTANT
Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 125
Assertion: Electric field due to a charged long conducting sheet does not depend on position of point from sheet.

Reason: Charged conducting sheet have uniform linear charge density.