A charged particle is moving in the presence of electric field ${{\bf{\vec E}}}$ and magnetic field ${\bf{\vec B}}.$ The directions of ${\bf{\vec E}}\;$ and ${{\bf{\vec B}}}$ are such that the charged particle moves in a straight line and its speed increases. The relations amongst ${{\bf{\vec E}}}$ , ${{\bf{\vec B}}}$ and velocity ${{\bf{\vec v}}}$ must be such that

${\bf{\vec E}}\;,{\bf{\vec B}}$ and ${{\bf{\vec v}}}$ are all parallel to each other

${\bf{\vec E}} \cdot {\bf{\vec B}} = 0,{\rm{\;}}{\bf{\vec v}}$ is arbitrary

${\bf{\vec E}} \cdot {\bf{\vec v}} = 0;{\bf{\vec B}} \cdot {\bf{\vec v}} = 0$ but ${\bf{\vec E}} \cdot {\bf{\vec B}} \ne 0$

${{\bf{\vec v}}}$ is parallel to ${{\bf{\vec E}}}$ and perpendicular to ${{\bf{\vec B}}}$

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NEET UG PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT

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A charged particle is moving in the presence of electric field

{\mathbf{\vec E}}

and magnetic field

\mathbf{\vec B}.

The directions of

\mathbf{\vec E}\;

and

{\mathbf{\vec B}}

are such that the charged particle moves in a straight line and its speed increases. The relations amongst

{\mathbf{\vec E}}

{\mathbf{\vec B}}

and velocity

{\mathbf{\vec v}}

must be such that

View answer and explanation

Correct option: B

\mathbf{\vec E}\;,\mathbf{\vec B}

and

{\mathbf{\vec v}}

are all parallel to each other

Option B (

\mathbf{\vec E}\;,\mathbf{\vec B}

and

{\mathbf{\vec v}}

are all parallel to each other) is correct because if all three vectors are parallel, the magnetic force is zero, and the electric force accelerates the particle in a straight line.

More Questions from MAGNETIC EFFECT OF CURRENT

Practice All Chapter MCQs →

Which of the following statements is not true A current loop in a magnetic field Given below are two statements:
Statement (I): When currents vary with time, Newton’s third law is valid only if momentum carried by the electromagnetic field is taken into account.
Statement (II): Ampere's circuital law does not depend on Biot-Savart’s law.
In the light of the above statements, choose the correct answer from the options given below: The magnetic field due to current carrying a circular loop of radius

5 \mathrm{~cm}

at a point on the axis at a distance of

12 \mathrm{~cm}

from the center is

250 \mu \mathrm{T}

. The magnetic field at the center of the loop is The magnetic field

d \vec{B}

due to a small current element

d \vec{l}

at distance

\vec{r}

and element carrying current

i

is Three long straight conductors carry currents 4A, 2A and 3A into the plane of paper. A circular path is imagined to be enclosing these currents. The value of

\oint {\overrightarrow B .\overrightarrow {dl} }

b is