Pick out the wrong statement.
- AAn electron at rest experiences no force in the magnetic field.
- BThe gain in the $KE$ of the electron moving at right angles to the magnetic field is zero.
- CWhen an electron is shot at right angles to the electric field,it traces a parabolic path.
- DAn electron moving in the direction of the electric field gains $KE$.
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Similar Questions
$A$ thin,straight conductor lies along the axis of a hollow conductor of radius $R$. The two carry equal currents in the same direction. The magnetic field $B$ is plotted against the distance $r$ from the axis. Which of the following best represents the resulting curve?
Difficult
View Solution$A$ particle of charge $+q$ and mass $m$ moving under the influence of a uniform electric field $E\hat i$ and a uniform magnetic field $B\hat k$ follows a trajectory from $P$ to $Q$ as shown in the figure. The velocities at $P$ and $Q$ are $v\hat i$ and $-2v\hat j$ respectively. Which of the following statement$(s)$ is/are correct?
DifficultIIT 1991
View Solution$A$ particle of specific charge $(q/m)$ is projected from the origin of coordinates with initial velocity $(u\hat{i} - v\hat{j})$. Uniform electric and magnetic fields exist in the region along the $+y$ direction,of magnitude $E$ and $B$ respectively. The particle will definitely return to the origin once if:
Two wires each carrying a steady current $I$ are shown in four configurations in Column $I$. Some of the resulting effects are described in Column $II$. Match the statements in Column $I$ with the statements in Column $II$.
Column $I$ Column $II$ $(A)$ Two parallel wires with current in the same direction,$P$ is the midpoint. $(p)$ The magnetic fields $(B)$ at $P$ due to the currents in the wires are in the same direction. $(B)$ Two coaxial circular loops with current in the same direction,$P$ is the midpoint on the axis. $(q)$ The magnetic fields $(B)$ at $P$ due to the currents in the wires are in opposite directions. $(C)$ Two coplanar circular loops with current in opposite directions,$P$ is the midpoint. $(r)$ There is no magnetic field at $P$. $(D)$ Two concentric coplanar circular loops with current in the same direction,$P$ is the common center. $(s)$ The wires repel each other.
| Column $I$ | Column $II$ |
| $(A)$ Two parallel wires with current in the same direction,$P$ is the midpoint. | $(p)$ The magnetic fields $(B)$ at $P$ due to the currents in the wires are in the same direction. |
| $(B)$ Two coaxial circular loops with current in the same direction,$P$ is the midpoint on the axis. | $(q)$ The magnetic fields $(B)$ at $P$ due to the currents in the wires are in opposite directions. |
| $(C)$ Two coplanar circular loops with current in opposite directions,$P$ is the midpoint. | $(r)$ There is no magnetic field at $P$. |
| $(D)$ Two concentric coplanar circular loops with current in the same direction,$P$ is the common center. | $(s)$ The wires repel each other. |
Match List-$I$ with List-$II$.
List-$I$ List-$II$ $(A)$ Permeability of free space $(I) \ [M L^2 T^{-2}]$ $(B)$ Magnetic field $(II) \ [M T^{-2} A^{-1}]$ $(C)$ Magnetic moment $(III) \ [M L T^{-2} A^{-2}]$ $(D)$ Torsional constant $(IV) \ [L^2 A]$
Choose the correct answer from the options given below:
| List-$I$ | List-$II$ |
| $(A)$ Permeability of free space | $(I) \ [M L^2 T^{-2}]$ |
| $(B)$ Magnetic field | $(II) \ [M T^{-2} A^{-1}]$ |
| $(C)$ Magnetic moment | $(III) \ [M L T^{-2} A^{-2}]$ |
| $(D)$ Torsional constant | $(IV) \ [L^2 A]$ |
Choose the correct answer from the options given below:
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