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An electron is not defiected in passing ...

An electron is not defiected in passing through a certain region of space. Can we be sure that there is no magnetic field in the region ?

Text Solution

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No, when the electron is moving parallel to magnetic field B, then `theta = 0^(@)`
`implies F = q v B sin 0^(@) = 0`
That is although the force is zero yet the magnetic field is present.
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