The figure shows three situations when an electron with velocity ( v ) travels through a uniform magnetic field ( B ). In each case, what is the direction of magnetic force on the electron?

NEET

Exam: NEET
Subject: Physics
Chapter: Magnetic Effects of Current

NEET · Physics · Magnetic Effects of Current

The figure shows three situations when an electron with velocity (...

The figure shows three situations when an electron with velocity (\overrightarrow{\mathrm{v}}) travels through a uniform magnetic field (\vec{B}). In each case, what is the direction of magnetic force on the electron?

Options

A+vez-axis, - vex-axis, + ve y-axis
B-ve z-axis, - ve $x$ -axis and zero
C+ ve z-axis, + vey-axis and zero
D- ve z-axis, + ve (\mathrm{x})-axis and zero

Correct answer

B. -ve z-axis, - ve $x$ -axis and zero

Step-by-step solution

According to Fleming's Right hand Rule In (1) force is in

-z

axis In (2) force is in -

x

-axis In (3) force is zero because (

\mathrm{F}=\mathrm{q}

(\overline{\mathrm{v}} \times \overline{\mathrm{B}})=\mathrm{qvB} \sin 180) i.e.

F=0

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