(a) Determine the electric field that yields the desired result. size: ___N/C di
ID: 1372948 • Letter: #
Question
(a) Determine the electric field that yields the desired result.
size: ___N/C
dir: ---Select--- +x dir -x dir +y dir -y dir none of these
(b) Suppose the electric field is to be produced by a parallel-plate capacitor with a plate separation of 2.5 cm. What potential difference is required between the plates?
___V
(c) Which plate in the figure should be positively charged?
(Make sure you understand why.)
bottom or top?
A beam of protons with various speeds is directed in the positive x direction. The beam enters a region with a uniform magnetic field of magnitude 0.55T pointing into the page, as shown below. It is desired to use a uniform electric field (in addition to the magnetic field) to select from this beam only those protons with a speed of 1.46 (a) Determine the electric field that yields the desired result. size: ___N/C dir: ---Select--- +x dir -x dir +y dir -y dir none of these (b) Suppose the electric field is to be produced by a parallel-plate capacitor with a plate separation of 2.5 cm. What potential difference is required between the plates? ___V (c) Which plate in the figure should be positively charged? (Make sure you understand why.) bottom or top? 10^5 m/s; that is, only these protons should be undeflected by the two fields.Explanation / Answer
a)
The electric field between the plates is
E / B = v
E = B v
= (0.55 T ) ( 1.46 *10 ^5 m/s )
= 80300 V/m
b)
Potential difference between the plates is
V = E d = ( 80300 V / m ) ( 2.5*10^ -2 m ) = 2007.5 V
c)
From right hand rule the electric field direction is downward. so the positive charged plate is upper plate.
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