Question

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

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

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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