MCQ
Value of $(\mu_{0}\in_{0})^{-1/2}$ is :
- A$3\times10^{7}m/s$
- ✓$3\times10^{8}m/s$
- C$3\times10^{9}m/s$
- D$3\times10^{10}m/s$
✓
Answer
Correct option: B.
$3\times10^{8}m/s$
B
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A non-conducting solid sphere of radius R is uniformly charged. The magnitude of the electric field due to the sphere at a distance r from its centre(a) Increases as r increases for r < R(b) Decreases as r increases for 0 < r < ∞(c) Decreases as r increases for R < r < ∞(d) a, c
In a double slit experiment, instead of taking slits of equal widths, one slit is made twice as wide as the other. Then in the interference pattern(a) The intensities of both the maxima and the minima increase (b) The intensity of maxima increases and the minima has zero intensity (c) The intensity of maxima decreases and that of the minima increases(d) The intensity of maxima decreases and the minima has zero intensity
A dielectric slab of thickness d is inserted in a parallel plate capacitor whose negative plate is at x = 0 and positive plate is at x = 3d. The slab is equidistant from the plates. The capacitor is given some charge. As one goes from 0 to 3d(a) The magnitude of the electric field remains the same(b) The direction of the electric field remains the same(c) The electric potential increases continuously(d) b, c
The work function of three metals $A , B$ and C are $1.92 eV , 2 eV , 5 eV$ respectively. On the basis of Einstein equation, when radiation of wavelength 4100 Å is used, the emission of electrons will be :
→The mutual characteristic curves of a triode are as shown in figure. The cut off voltage for the triode is
In Bohr model of hydrogen atom, the ratio of periods of revolution of an electron in n = 2 and n = 1 orbits is(a) 2 : 1(b) 4 : 1(c) 8 : 1(d) 16 : 1
Monica wanted to take photographs of a monument. But since the surrounding is filled with smoke, she is not able to take good photos. Which one of the following electromagnetic waves can be used in this situation to help Monica?
A student has $10$ resistors of resistance $' r\ '.$ The minimum resistance made by him from given resistors is
→No work is done by a force on an object if:
- The force is always perpendicular to its velocity.
- The force is always perpendicular to its acceleration.
- The object is stationary but the point of application of the force moves on the object.
- The object moves in such a way that the point of application of the force remains fixed.
Electromagnetic waves are transverse in nature is evident by(a) Polarization(b) Interference(c) Reflection(d) Diffraction