Question #4730f

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Question #4730f

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Answer 1 · 2015-05-30T04:24:40

Magnetic force (or any other force) may be measured using a torsion balance, which is a sensitive device to measure force.
Coulomb, himself used a torsion balance to discover the Coulomb's law and inverse square law of forces between magnetic poles.

Now, the magnetic force a magnetic field $B$ $B$ exerts on a charge $q$ $q$ moving with velocity $v$ $v$ making an angle $θ$ $theta$ with the field is given by the Lorentz force formula,

$F = q v B sin θ$ $F = qvBSin theta$

This gives an expression to calculate the magnetic force on a charged particle in a magnetic field.

Moreover, from the Coulomb's law of magnetic interations, the force of attraction (or repulsion) between two magnetic poles of pole strengths $q_{m} 1$ $q""_m1$ and $q_{m} 2$ $q""_m2"$ respectively separated by a distance $r$ $r$ is given by, (in vacuum)

$F = \frac{μ_{0} \cdot q_{m} 1 q_{m} 2}{4 π r^{2}}$ $F = (mu""_0*q""_m1q""_m2)/(4pir^2)$

where $μ_{0}$ $mu""_0$ is the permeability of free space. The force acts along the line joining the magnetic poles.

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Question #4730f

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