Electrostatics, finding velocity


by physics604
Tags: electrostatics
physics604
physics604 is offline
#1
Jun11-13, 08:57 PM
P: 85
1. An electron orbits the nucleus of an atom with velocity v. If this electron were to orbit the same nucleus with twice the previous orbital radius, its orbital velocity would now be

a) [itex]\frac{v}{2}[/itex]
b) v
c) 2v
d) [itex]\frac{v}{√2}[/itex]


2. Relevant equations

[itex]\Delta[/itex]Ek + [itex]\Delta[/itex]Ep = 0 ?

3. The attempt at a solution

I'm not really sure how I should start this question. None of the equations I have include both the v and the r variable.
Phys.Org News Partner Science news on Phys.org
Lemurs match scent of a friend to sound of her voice
Repeated self-healing now possible in composite materials
'Heartbleed' fix may slow Web performance
berkeman
berkeman is offline
#2
Jun11-13, 10:05 PM
Mentor
berkeman's Avatar
P: 39,575
What is the equation for electrostatic attraction?
physics604
physics604 is offline
#3
Jun11-13, 10:41 PM
P: 85
F = kQ1Q2 / r2

But I don't see how that helps.

berkeman
berkeman is offline
#4
Jun12-13, 12:01 AM
Mentor
berkeman's Avatar
P: 39,575

Electrostatics, finding velocity


Quote Quote by physics604 View Post
F = kQ1Q2 / r2

But I don't see how that helps.
And the equation that we use for centripital force for uniform circular motion? There is a reason that we ask you to list the Relevant Equations...


Register to reply

Related Discussions
Finding initial velocity given displacement, time, and final velocity Introductory Physics Homework 1
Electrostatics - Finding potential V(r,z) given hyperbolic boundry conditions. Advanced Physics Homework 1
Is there a formula in electrostatics analogous to escape velocity? Classical Physics 4
Electrostatics - finding magnitude of a third charged particle Introductory Physics Homework 8
electrostatics. finding the resultant force! Introductory Physics Homework 1