Home
Class 12
PHYSICS
A charged plastic spherical ball of mass...

A charged plastic spherical ball of mass `8.4 xx 10^(-14) kg` is found to remain suspended in a uniform electric field of Entensity `5 xx 10^2 NC^(-1)`. Calculate the charge on the ball.

Text Solution

Verified by Experts

` m = 8.4 xx 10^(-14)` kg
`E = 5 xx 10^2 NC^(-1)`
Let q = charge on the ball
Ball will remain suspended only when Electric force acting in upward direction= Weight of the ball in downward direction.
`qE = mg`
`q = (mg)/E`
`q = (8.4 xx 10^(-14) xx 9.8)/(5 xx 10^2)`
`q = 16.46 xx 10^(-16) C`
or `q = 1.65 xx 10^(-15) C`
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • ELECTRIC FIELD

    BETTER CHOICE PUBLICATION|Exercise NUMERICAL PROBLEMS |10 Videos
  • ELECTRIC CURRENT, RESISTANCE AND E.M.F.

    BETTER CHOICE PUBLICATION|Exercise MOST EXPECTED QUESTIONS |14 Videos
  • ELECTRICAL DEVICES

    BETTER CHOICE PUBLICATION|Exercise (MOST EXPECTED QUESTIONS 2 MARK)|2 Videos

Similar Questions

Explore conceptually related problems

A charged plastic spherical ball of mass 8.4xx 10^(-14) kg is found to remain suspended in a uniform elastic field intensity 5xx 10^(-14) C. Calculate the charge on the ball.

An electric dipole with dipole moment 4 xx 10^(-9)C m is aligned at 30° with the direction of a uniform electric field of magnitude 5 xx 10^(4) N C^(-1) . Calculate the magnitude of the torque acting on the dipole.

A copper ball of density 8.6 g cm^-3 cm in diameter is immersed in oil of density 0.8 g cm^-3 . If the ball remains suspended in oil in a uniform electric field of intensity 36,000 NC^-1 acting in upward direction, what is the charge on the ball?

An Electric dipole with dipole moment 4 xx 10^9cm is aligned at an angle 30^@ with the direction of uniform electric field of magnitude 5 xx 10^4 NC^(-1) , Calculate the magnitude of the torque acting on the electric dipole.

Find the time taken by a particle of mass 10^(-18) kg and carrying a charge 3.2 xx 10^(-19) C to fall through a distance of 8.0 m in a uniform electric field of intensity 8 xx 10^(2) NC^(-1) .

A particle of mass 10^(-3) kg and charge 5 muC is thrown at a speed 20 ms^(-1) against a uniform electric field of strength 2 xx 10^5 NC^(-1) . How much distance will it travel before coming to rest monentarily ?

Find the time taken by a particle of mass 4 xx 10^(-18) kg and carrying a charge 6.4 xx 10^(19) C to fall through a distance of 2 m in a uniform electric field of intensity 4 xx 10^2 NC^(-1)

A particle of mass 10^-3 kg and charge 5 muC is thrown at a speed 20 ms^-1 against a uniform electric field of strength 2xx 10^5 NC^-1 , How much distance will it travel before coming to rest momentarily?

An ion carrying a charge 6.4 xx 10^(-19)C is revolving in circular path in a magnetic field of intensity 4 xx 10^(-4)T . Calculate the frequency of revolution if the mass of ion is 2.8 xx 10^(-26)kg .

An electric dipole with diple moment 4xx10^-9 C m is aligned at 30^@ with the direction of unifrom electric field of 5xx10^-3NC^-1 . Calculate magnitude of the torque acting on the dipole.