Question

The negatively charged particle pictured above is acceleration in the direction indicated by the red arrow, due to the influence of an electrice field.
Which black arrow BEST indicates the direction of the electric field at the location of this negative particles?

• A. $\downarrow$
• B. $\leftarrow$
• C. $\uparrow$
• D. $\to$
• E. The electric field strength at the location of the negatively charged particle is zero

Answer 1

Answer: (B)

$\leftarrow$

If $m$ be the mass of the negative charge $-q$ and $a$ be the acceleration of charge, then $ma=(-q)E$ or $E=-\frac{ma}{q}$

From this we can say that the field E will be in the opposite direction of acceleration i.e to the left $(\leftarrow )$.

Thus option B will correct.