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Question

Biot-Savart law indicates that the moving electrons (velocity $$\bar v$$ ) produce a magnetic field $$\bar B$$ such that:


A
¯B¯v
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B
¯B¯v
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C
it obeys inverse cube law.
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D
it is along the line joining the electron and point of observation.
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Solution

The correct option is A $$\bar B \perp \bar v$$
Magnetic field produced by charges moving with velocity $$\bar v$$, at a distance r is $$ \bar B$$ = $$\left ( \dfrac{\mu_0}{4\pi } \right )$$.q$$\dfrac{\bar v \times \hat r}{r^2}$$
Therefore $$\bar B \perp \bar v$$

Physics

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