MCQ
A thin hollow copper pipe carries direct current than which is incorrect
  • A
    Magnetic field inside the pipe is zero
  • B
    Magnetic field is not zero out side the pipe
  • C
    Electric field on the surface of pipe is not zero
  • Electric field outside the pipe is not zero

Answer

Correct option: D.
Electric field outside the pipe is not zero
d

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

For photo-electric effect with incident photon wavelength $\lambda$, the stopping potential is $V _0$. Identify the correct variation$(s)$ of $V _0$ with $\lambda$ and $1 / \lambda$. $Image$
A spring-mass system vibrates such that mass travel on surface of coefficient of friction  $\mu$. Mass is released after compressing the spring by distance a and it travels upto  distance $b$ after its equilibrium position, then travelling from $x = -a$ to $x = b$ the reduction in its amplitude will be :-
$10$ resistors each of resistance $10\,\Omega$ can be connected in such as to get maximum and minimum equivalent resistance. The ratio of maximum and minimum equivalent resistance will be $..........$.
You are given two lenses, a converging lens with focal length $+10\, cm$ and a diverging lens with focal length $- 20 \,cm$. Which of the following would produce a virtual image that is larger than the object?
Three objects $A$, $B$ and $C$ are kept in a straight line on a frictionless horizontal surface. These have masses $m, 2 m$ and $m$, respectively. The object $A$ moves towards $B$ with a speed $9 \mathrm{~m} / \mathrm{s}$ and makes an elastic collision with it. Thereafter, $B$ makes completely inelastic collision with $C$. All motions occur on the same straight line. Find the final speed (in $\mathrm{m} / \mathrm{s}$ ) of the object $\mathrm{C}$.
The amplification factor of a triode is $20$. If the grid potential is reduced by $0.2\, volt$ then to keep the plate current constant its plate voltage is to be increased by.......$volt$
A uniform wire of resistance $9$ $\Omega$ is cut into $3$ equal parts. They are connected in the form of equilateral triangle $ABC$. A cell of $e.m.f.$ $2\,V$ and negligible internal resistance is connected across $B$ and $C$. Potential difference across $AB$ is ............... $V$
An ideal gas undergoes the process $1 \rightarrow 2$ as shown in the figure, the heat supplied and work done in the process is $\Delta \,\,Q$ and $\Delta \,\,W$ respectively. The ratio $\Delta \,\,Q :$ $\Delta \,\,W$ is
An $X-$ ray tube operates on $30 kV$. What is the minimum wavelength emitted.......$\mathop A\limits^o $ $(h = 6.6 \times {10^{ - 34}}Js$, $e = 1.6 \times {10^{ - 19}}$Coulomb, $c = 3 \times {10^8}ms-1$)
Assertion : Diamagnetic materials can exhibit magnetism.

Reason : Diamagnetic materials have permanent magnetic dipole moment.