MCQ
The maximum current that flows through a fuse wire before it blows out varies with its radius as
  • ${r^{3/2}}$
  • B
    $r$
  • C
    ${r^{2/3}}$
  • D
    ${r^{1/2}}$

Answer

Correct option: A.
${r^{3/2}}$
a
(a) It is called safe current and is proportional to ${r^{3/2}}$.

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

A particle starts moving rectilinearly at time $t = 0$ such that its velocity $'v'$ changes with time $'t'$ according to the equation $v = t^2 - t$ where $t$ is in seconds and $v$ is in $m/s.$ The time interval for which the particle retards is
A wave disturbance in a medium is described by $y(x,\,t) = 0.02\cos \,\left( {50\,\pi t + \frac{\pi }{2}} \right)\cos (10\pi x)$, where $ x$ and $y$ are in metres and $t$ in seconds
Co-ordinate of image with respect to origin $c$ will be :-
Which of the following components of a $LCR$ circuit, with $ac$ supply, dissipates energy
In the circuit given below, what will be the reading of the voltmeter.....$V$
Two identical radiators have a separation of $d = \lambda /4$ where $\lambda $ is the wavelength of the waves emitted by either source. The initial phase difference between the sources is $\pi /4.$ Then the intensity on the screen at a distant point situated at an angle $\theta = 30^\circ $ from the radiators is (here ${I_o}$ is intensity at that point due to one radiator alone)
In the circuit shown initially $C_1, C_2$ are uncharged. After closing the switch
If a body is thrown up with the velocity of $15 \,m/s$ then maximum height attained by the body is..........$m$ ($g = 10\,m/{s^2}$)
Two rails of a railway track insulated from each other and the ground are connected to a milli voltmeter. What is the reading of voltmeter, when a train travels with a speed of $180$ $km/hr$ along the track. Given that the vertical component of earth's magnetic field is $0.2 \times {10^{ - 4}}\,weber/{m^2}$ and the rails are separated by $1$ metre
A small bulb is placed at the bottom of a tank containing water to a depth of $\sqrt{7} \; m$. The refractive index of water is $\frac{4}{3}$. The area of the surface of water through which light from the bulb can emerge out is $x \,\pi m ^{2}$. The value of $x$ is ...............