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A proton is released from rest, 10 cm fr...

A proton is released from rest, 10 cm from a charged sheet carrying charged density of `-2.21xx10^-9C//m^2`. It will strike the sheet after the time (approximately)

A

`4mus`

B

`2mus`

C

`sqrt2mus`

D

`4sqrt2mus`

Text Solution

Verified by Experts

The correct Answer is:
A
`|a|=|(qE)/m|=|(qsigma)/(2epsilon_0m)|`
`t=sqrt((2s)/a)=sqrt((4sepsilon_0m)/(|q||sigma|))`
`=sqrt((4xx0.1xx8.86xx10^-12xx1.67xx10^-27)/(1.6xx10^-19xx2.21xx10^-9))`
`=4xx10^-s`
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DC PANDEY-ELECTROSTATICS-Level 1 Objective
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  2. Four positive charges (2sqrt2-1)Q are arranged at the four corners of ...

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  4. Two point charges +q and -q are placed a distance x apart. A third ch...

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  5. Charge 2q and -q are placed at (a,0) and (-a, 0) as shown in the figur...

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  6. Five point charge (+q each) are placed at the five vertices of a regul...

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  7. Two identical small conducting spheres having unequal positive charges...

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  8. Three concentric conducting spherical shells carry charges +4Q on the ...

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  9. 1000 drops of same size are charged to a potential of 1 V each. If the...

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  10. Two concentric conducting spheres of radii R and 2R are crrying charge...

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  11. Charges Q, 2Q, and -Q are given to three concentric conducting spheric...

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  12. The electric field in a region of space is given by E=5hati+2hatjN//C....

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  13. A charges Q is placed at each of the two opposite corners of a square....

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  14. A and B are two concentric spherical shells. If A is given a charge +q...

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  15. A solid sphere of radius R has charge q uniformly distributed over its...

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  16. Four dipoles each of magnitudes of charges +-e are placed inside a sph...

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  17. A pendulum bob of mass m charge q is at rest with its string making an...

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  18. Two isolated charged conducting spheres of radii a and b produce the s...

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  19. Two point charges+q nd -q are held fixed at (-a,0) and (a,0) respectiv...

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  20. A conducting shell S1 having a charge Q is surrounded by an uncharged ...

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