Mass of Object in Uniform Electric Field

  • Thread starter Thread starter gotpink74
  • Start date Start date
  • Tags Tags
    Mass
AI Thread Summary
An object with a net charge of 18 µC is placed in a uniform electric field of 597 N/C and is floating, indicating that the upward electric force equals the downward gravitational force. The discussion highlights the need to equate these forces to find the mass of the object. The upward force is due to the electric field, while the downward force is the weight of the object. The solution involves setting the electric force equal to the gravitational force to solve for mass. The participant successfully resolved the problem after clarifying the forces involved.
gotpink74
Messages
48
Reaction score
0

Homework Statement



An object with a net charge of 18 µC is placed in a uniform electric field of 597 N/C, directed vertically. What is the mass of the object if it floats in the electric field?

Homework Equations



F=kq1q2/r^2

The Attempt at a Solution


dont understand at all
 
Physics news on Phys.org
Ok, start with the first statement, they said the electric field is directed upwards. So what force is upwards?

Naturally what force will be exerted on the mass downwards?

Now put these two equal to each other.
 
thank you i solved it
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
View full post »

Similar threads

Dipole placed in a uniform electric field
Replies
11
Views
3K
Find net velocity of charged particle in electric field (symbols only)
Replies
14
Views
3K
Confused about direction of electric field
Replies
7
Views
3K
Electric field & force due to charged insulating hemispherical shells
Replies
12
Views
2K
Why is electric field at the center of a charged disk not zero?
Replies
4
Views
3K
Understanding the energy of a dipole in a uniform electric field
Replies
2
Views
2K
Prove that the field due to a circular arc is same as its bounded tangent at the centre of curvature
Replies
23
Views
1K
Why Is Work Positive When Done Against the Electric Field?
Replies
22
Views
3K
Electric field inside non-conducting spherical shell
Replies
5
Views
4K
How an Electric Field is affected by an Insulator
Replies
2
Views
3K

Hot Threads

Recent Insights

Back
Top