Question

An electron is released from the origin at a place where a uniform electric field $\vec{E}$ and uniform magnetic field $\overrightarrow{\mathrm{B}}$ exists along the negative $\mathrm{y}$-axis and negative $z$-axis respectively. Then which of the following are INCORRECT.

Accepted Answer

At $\mathrm{t}=\frac{2 \pi \mathrm{m}}{3 \mathrm{eB}}$, the $\mathrm{y}$-component of velocity becomes zero.

Answer

At time $t$ the $y$-component of velocity of the electron becomes $v_y=\frac{E}{B} \sin \omega t$, where $\omega=\frac{e B}{m}$

Answer

At $t=\frac{\pi m}{e B}$ the electron will have only $x$-component of velocity.

Answer

The displacement along $y$-axis is $\frac{2 E m}{\mathrm{eB}^2}$, when the velocity of electron becomes perpendicular to the $y$-axis.

NEET UG PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT

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