Home
Class 11
PHYSICS
At what separation should two equal char...

At what separation should two equal charges 1.0 C each, be placed so that the force between them equals the weight of a 50 kg person?

Text Solution

Verified by Experts

The correct Answer is:
A
Force of attraction betwenteh two charges
`= 1/ (4pi epsilon_0 (q_1 q_2)/r^2`
` (9xx10^9xx1xx1`/r^2`
But force of attraction is equal of the weight,
`:. Mg= (9xx10^9)/r^2`
`rarr r^2 = (9xx10^9)/(mxx10) = (9xx10^8)/m`
taking g= 10 m/s^2
`rarr r^2 = (9xx10^8)/m `
`rarr r= (3xx10^4)./m m `
e.g Assuming `m= 64 kg`
` r= (3xx10^4)/(sqrt(64))`
` 3/8xx10^4 m`
=3750 m.
Promotional Banner

Topper's Solved these Questions

  • THE FORCES

    HC VERMA|Exercise Objective -2|7 Videos

  • SPECIFIC HEAT CAPACITIES OF GASES

    HC VERMA|Exercise All Questions|74 Videos

  • WAVE MOTION AND WAVES ON A STRING

    HC VERMA|Exercise Exercises|57 Videos

Similar Questions

Explore conceptually related problems

Two equal charges are placed at a separtion of 1.0 m. What should be the magnitude of the charges so that the force between them equals of a 50 kg person?

Two sphereical bodies, each of mass 50 kg, are placed at a separation of 20 cm. Equal charges are placed on the bodies and it is found that the force of Coulomb repulsion equals the grativational attraction in magnitude. Find the magnitude of the charge placed on either body.

A charge Q is to be divided on two objects. What should be the values of the charges on the objects so that the force between the objects can be maximum?

Two particles A and B having charges 8.0 xx 10 ^(-6) C and -2.0 xx 10(-6) C respectively are held fixed with a. separtion of 20cm. Where should a thired charged. particle be placed so that it dose not experience a net electric force?.

Two large glass plates are placed vertically and parallel to each other inside a tank of water with separation between the plates equal to 1 mm. Find the rise of water in the space between the plates. Surface tension of water =0.075Nm^-1 .

Two chargea 2.0xx10^(-6) C and 1.0xx10^(-6) C are placed at a separation of 10 cm. where should a third charge be placed such that it experiences no net force due to these charges.

Three particles, each having a charge of 10 muC , are placed at the vertices of an equilateral triangle of side 10 cm. Find the work done by a person in pulling them apart to infinite separations.

A charge of 1.0 C is placed at the top of your college building and another equal charge at the top of your house. Take the separaton between the two charges to be 2.0 km. Find the force exerted by the charges on each other. How many time of your weight is this force?

Two equal charges, 2.0xx10^(-7) C each, are held fixed at a separation of 20cm. A third charge of equal magnitude is placed midway between the two both the charges. How much work is done by the electric field during the process?

Two identical metal sphere have charges +15 mu C and +25 mu C and are separated by a distance . If the spheres are first brought into contact and then separated to the original distance then the ratio of the force between them to the previous force is