First slide

Force on a charged particle moving in a magnetic field

Question

Statement 1: If an electron, while coming vertically from outer space, enter the earth's magnetic field, it is deflected towards west.
Statement 2: Electron has negative charge.

Easy

A

Both statements 1 and 2 are correct
B

Statement 1 is correct statement 2 is incorrect
C

Statement 1 is incorrect statement 2 is correct
D

Both statements 1 and 2 are incorrect

Solution

We know that the direction of the earth's magnetic field is toward north and the velocity of electron is vertically downward. Applying Fleming's left hand rule, the direction of force is towards west. Therefore, an electron corning from outer space will be deflected toward west.

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