A positively charged particle projected towards east is deflected towards north by a magnetic field. In which direction the magnetic field may be ?
Answer & explanation
Correct answer: option 4
Right Hand Rule :
Let east as X-Axis , North as Y-Axis and vertically upward as Z-axis.
$\vec{F} = q\vec{V}\times \vec{B}$
F Is along $\hat{j}$ , velocity is along $\hat{i}$ hence B must be along $-\hat{k}$