A horizontal overhead power line is at a height of $4\,m$ from the ground and carries a current of $100\,A$ from east to west. The magnetic field directly below it on the ground is $(\mu _0 = 4\pi \times 10^{-7}\,TmA^{-1})$
Medium
Download our app for free and get started
The magnetic field $B=\frac{\mu_{0}}{4 \pi} \frac{2 I}{r}=10^{-7} \times \frac{2 \times 100}{4}=5 \times 10^{-6} T$
According to right hand palm rule, the magnetic fleld is directed towards south.
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 charge $q$ is released in presence of electric $(E)$ and magnetic field $(B)$ then after some time its velocity is $v$ thenView Solution
- 2$AB$ and $CD$ are long straight conductor, distance $d$ apart, carrying a current $I$. The magnetic field at the midpoint of $BC$ isView Solution
- 3A particle with charge $q$, moving with a momentum $p$, enters a uniform magnetic field normally. The magnetic field has magnitude $B$ and is confined to a region of width $d$, where $d < \frac{p}{{Bq}}$, The particle is deflected by an angle $\theta $ in crossing the fieldView Solution
- 4View SolutionA galvanometer can be converted into an ammeter by connecting
- 5A conductor lies along the $z-$axis $a$ $-1.5$$ \le Z < 1.5\,m$ carries a fixed current of $10.0\ A$ in $ - {\hat a_z}$ direction (see figure). For a field $\vec B$ $=$ $3.0 \times 10^{-4}$ $e^{-0.2x}$ ${\hat a_y}\,T$ find the power required to move the conductor at constant speed to $x = 2.0\ m, y = 0\ m$ in $5 \times 10^{-3}\ s$. Assume parallel motion along the $x-$axis........$ W$View Solution
- 6The current flowing through a coil of resistance $900\, ohms $ is to be reduced by $90\,\%$. What value of shunt should be connected across the coil ............. $\Omega $View Solution
- 7A $90\, cm$ long solenoid has six layers of windings of $450\, turns$ each. If the diameter of solenoid is $2.2\, cm$ and current carried is $6\, A$, then the magnitude of magnetic field inside the solenoid, near its centre isView Solution
- 8In the figure, what is the magnetic field at the point $O$View Solution
- 9This question has Statement $1$ and Statement $2$ . Of the four choices given after the Statements, choose the one that best describes the two Statements.View Solution
Statement $1$: A charged particle is moving at right angle to a static magnetic field . During the motion the kinetic energy of the charge remains unchanged.
Statement $2$: Static magnetic field exert force on a moving charge in the direction perpendicular to the magnetic field.
- 10The figure below shows the north and south poles of a permanent magnet in which $n$ turn coil of area of cross-section $A$ is resting, such that for a current $ i$ passed through the coil, the plane of the coil makes an angle $\theta $ with respect to the direction of magnetic field $B.$ If the plane of the magnetic field and the coil are horizontal and vertical respectively, the torque on the coil will beView Solution
