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General Physics

Scorching goIITian

 Joined: 4 Dec 2008 Post: 257
10 May 2010 16:00:52 IST
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What is dunnington's method of e/m determination for the electron?
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What is dunnington's method of e/m determination for the electron?

Hot goIITian

Joined: 15 Feb 2010
Posts: 102
10 May 2010 16:08:37 IST
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Electrons are accelarated in alternating electric and magnetic field.

ma= qE + q( v X B) is applied.

Hot goIITian

Joined: 18 Jan 2009
Posts: 173
10 May 2010 22:03:04 IST
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When charged particles move in electric and magnetic fields the following two laws apply;

$\mathbf{F} = Q (\mathbf{E} + \mathbf{v} \times \mathbf{B}),$ (Lorentz force law)
$\mathbf{F}=m\mathbf{a}$ (Newton's second law of motion)

where F is the force applied to the ion, m is the mass of the particle, a is the acceleration, Q is the charge, E is the electric field, and v xB is the vector cross product of the ion velocity and the magnetic field.

Using Newton's third law of motion yields:

$(m/Q)\mathbf{a} = \mathbf{E}+ \mathbf{v} \times \mathbf{B}$.

Hot goIITian

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10 May 2010 22:04:03 IST
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Blazing goIITian

Joined: 8 Oct 2008
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26 May 2010 01:34:22 IST
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hii

The "q/m" of an electron was successfully calculated by J. J. Thomson in

1897—and more successfully by Dunnington's Method, which involves

the angular momentum and deflection due to a perpendicular magnetic field.

ma= qE + q( v X B)              !!!!!

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15 May 2013 19:30:11 IST
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What is dunnington's method of e/m determination for the electron?

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