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(A ): Magnitude of electric force acting...

(A ): Magnitude of electric force acting on a proton and an electron, moving in a uniform electric field is same, where as acceleration of electron is 1836 times that of a proton.
(R ): Electron is lighter than proton.

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:
B
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AAKASH SERIES-ELECTRIC CHARGES AND FIELDS-Exercise-I
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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. (A) : In a cavity within a conductor, the electric field is zero. (R...

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  19. (A): A bird perches on a high power lines and nothing happends to the ...

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