Find the magnitude of the magnetic field that will cause the electron to follow the semicircular path from A to B.

Explanation:

The attached figure shows the path followed by an electron in the semicircular path from A to B.

Velocity of the electron is,

It can be seen from the figure that the radius of thenpath, r = 5 cm or 0.05 m

The magnetic force acting on the electron is balanced by the centripetal force acting on it. It means,

B is the magnitude of the magnetic field

So, the magnitude of the magnetic field is .

current flows in a wire

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