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Assertion : In a cavity within a conduct...

Assertion : In a cavity within a conductor, the electric field is zero.
Reason : Charges in a conductor reside only at its surface.

A

Both .A. and .R. are true and .R. is the correct explanation of .A.

B

Both .A. and .R. are tru and .R. is not the correct explanation of .A.

C

A. is true and .R. is false

D

A. is false and .R. is true

Text Solution

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The correct Answer is:
A
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AAKASH SERIES-ELECTRIC CHARGES AND FIELDS-Exercise-I
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  2. (A): Two particles of same charge projected with different velocity no...

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  4. (A): Electric and gravitational fields are acting along same line. Whe...

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  5. Assertion : If there exists coulomb attraction between two bodies, bot...

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  6. (A) : No two electric lines of force can intersect each other (R ): ...

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  7. (A ): Magnitude of electric force acting on a proton and an electron, ...

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  8. (A ): Sharper is the curvature of spot on a charged body lesser will b...

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  9. (A ): The surface densities of two spherical conductors of different r...

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  10. (A ): A charged particle free to move in an electric field always move...

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  11. (A ): Mass of a body decreases slightly when it negatively charged. ...

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  12. (A ): Coulomb force is a long range force. (R ): Coulomb force acts ...

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  13. (A): A small metal ball is suspended in a uniform electric field with ...

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  14. (A ): A charge is lying at the centre of the line joining two similar ...

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  15. (A): If a conducting medium is placed between two charges, then electr...

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  16. (A): A point charge is lying at the centre of a cube of each side. The...

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  17. Assertion : In a cavity within a conductor, the electric field is zero...

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  18. (A): The typres of aircrafts are slightly conducting. (R ): If a con...

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  19. Assertion : A bird perches on a high power line and nothing ...

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  20. A: A metallic shield in the form of a hollow shell may be built to blo...

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