Go Back   Physics Help Forum > High School and Pre-University Physics Help > Electricity and Magnetism

Electricity and Magnetism Electricity and Magnetism Physics Help Forum

Reply
 
LinkBack Thread Tools Display Modes
Old Apr 18th 2018, 12:11 PM   #1
Junior Member
 
Join Date: Jan 2018
Posts: 4
Smile what magnitude of uniform magnetic field are needed

$\textsf{ You wish to hit a target from several meters away with a
charged coin having a mass of $4.2 g$ and charge of $+2400 \, \mu C$}\\$

$\textsf{The coin is given an initial velocity of $14.0 \, m/s$, and a
downward uniform electric field strenght $29 \, N/C$
exists throuhout the region.}\\$

$\textit{If you aim directly at the target and fire the coin horizontally }$

$\textit{what magnitude of uniform magnetic field are need in the region for the coin to hit the target?.}$

$\textit{Give answer using two significant figures}$

Ok this is all new to me and study this on my own
I know this is a relatively easy prob but I am still ??

appreciate much

Last edited by countdown; Apr 19th 2018 at 11:42 AM. Reason: latex
countdown is offline   Reply With Quote
Old May 11th 2018, 03:13 AM   #2
Senior Member
 
Join Date: Dec 2008
Location: Udupi, Karnataka, India
Posts: 292
What is the force acting on a charged particle in uniform electric field and uniform magnetic field? To hit the target, these two forces should be neutralized.
sa-ri-ga-ma is offline   Reply With Quote
Old May 11th 2018, 04:33 AM   #3
Senior Member
 
Join Date: Aug 2010
Posts: 347
The gravitational force here is so weak, compared to the electric and magnetic forces, it does not need to be taken into account. There will be a downward force of 29(2400)= 69600 N due to the electric field. So the magnetic field has to produce 69600 N upward. The force due to a magnetic field of strength B, on an object with charge c with speed v (assuming the velocity is at right angles to the magnetic field direction) is Bvc.
HallsofIvy is offline   Reply With Quote
Reply

  Physics Help Forum > High School and Pre-University Physics Help > Electricity and Magnetism

Tags
field, magnetic, magnitude, needed, uniform



Thread Tools
Display Modes


Similar Physics Forum Discussions
Thread Thread Starter Forum Replies Last Post
Electric field inside non-uniform shells Skyrim Advanced Electricity and Magnetism 11 May 22nd 2011 10:26 PM
A neutral metal rod in a uniform magnetic field... ZergLurker Advanced Electricity and Magnetism 1 Apr 12th 2010 11:43 PM
find magnitude of the magnetic field van-hilst Advanced Electricity and Magnetism 2 Dec 26th 2009 11:37 AM
magnitude of magnetic field alex83 Electricity and Magnetism 1 Dec 14th 2009 01:47 PM
help needed... velocity, and magnitude christina Kinematics and Dynamics 5 Oct 8th 2009 12:09 PM


Facebook Twitter Google+ RSS Feed