An electric field of $1500\, V/m$ and a magnetic field of $0.40\, weber/metre^2$ act on a moving electron. The minimum uniform speed along a straight line the electron could have is
Medium
Download our app for free and get started
When the electron moves in both electric and magnetic fields then :
$\mathrm{q} \mathrm{E}=\mathrm{qvB}$
$\therefore $ $v=$ $\frac{E}{B}-\frac{1500}{0.40}=370\, \mathrm{m} / \mathrm{s}$
$=3.75 \times 10^{3}\, \mathrm{m} / \mathrm{s}$
Download our appand get started for free
Experience the future of education. Simply download our apps or reach out to us for more information. Let's shape the future of learning together!No signup needed.*
Similar Questions
- 1A galvanometer having a coil resistance of $30\,\Omega $ shows full scale deflection when a current of $2\,A$ passes through it. It can be converted into an ammeter to read currents upto $10\,A$ byView Solution
- 2An alternating electric field, of frequency $f$, is applied across the dees $(\, radius \,\approx\, R)$ of a cyclotron that is being used to accelerate protons $(\,mass \,\approx \, m).$ The operating magnetic field $(B)$ used in the cyclotron and the kinetic energy $(K)$ of the proton beam, produced by it, are given byView Solution
- 3A long straight wire along the $z-$ axis carries a current $I$ in the negative $z$ direction. The magnetic field vector $\vec B$ at a point having coordinates $(x, y)$ in the $z = 0$ plane isView Solution
- 4An electron is moving with a speed of ${10^8}\,m/\sec $ perpendicular to a uniform magnetic field of intensity $B$. Suddenly intensity of the magnetic field is reduced to $B/2$. The radius of the path becomes from the original value of $r$View Solution
- 5View SolutionA stream of electrons is projected horizontally to the right. A straight conductor carrying a current is supported parallel to electron stream and above it. If the current in the conductor is from left to right then what will be the effect on electron stream
- 6A current carrying wire of length $L$ is transformed into a coil of $N$ turns. To achieve maximum magnetic moment, the coilView Solution
- 7A long straight wire in the horizontal plane carries a current of $50\, A$ in north to south direction. Give the magnitude and direction of $B$ at a point $2.5\,m$ east of the wireView Solution
- 8A particle having a charge of $10.0\,\mu C$ and mass $1\,\mu g$ moves in a circle of radius $10\,cm$ under the influence of a magnetic field of induction $0.1\,T$. When the particle is at a point $P$, a uniform electric field is switched on so that the particle starts moving along the tangent with a uniform velocity. The electric field is......$V/m$View Solution
- 9An elastic circular wire of length $l$ carries a current $I$. It is placed in a uniform magnetic field $\mathop B\limits^ \to $ (Out of paper) such that its plane is perpendicular to the direction of $\mathop B\limits^ \to $. The wire will experienceView Solution
- 10An electron is moving along positive $x$-axis. To get it moving on an anticlockwise circular path in $x-y$ plane, a magnetic filed is appliedView Solution