Question

An electron moving along a horizontal line with respect to the observer and towards the north. Due to each magnetic field, it deflects towards the east then position observer:-

• A. In NHS
• B. In SHS
• C. At Equator
• D. None

Answer 1

The correct option is A In NHS

The magnetic field lines from south to north,

${\overrightarrow{F}}_m=q(\overrightarrow{v}\times \overrightarrow{B})$

The direction of electron velocity is in the negative y-axis.

$\hat{i}=-\hat{j}\times -\hat{k}$

The magnetic field along the direction of $-\hat{k}$

It is possible only in NHS.

The correct option is A.