Physics Help Forum what magnitude of uniform magnetic field are needed

 Electricity and Magnetism Electricity and Magnetism Physics Help Forum

 Apr 18th 2018, 12:11 PM #1 Junior Member   Join Date: Jan 2018 Posts: 4 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
 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.
 May 11th 2018, 04:33 AM #3 Senior Member   Join Date: Aug 2010 Posts: 331 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.

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