Question
The average e.m.f. induced in a coil in which the current changes from 2 ampere to 4 ampere in 0.05 second is 8 volt. What is the self inductance of the coil ?(a) 0.1 H(b) 0.2 H (c) 0.4 H(d) 0.8 H
✓
Answer
(b) 0.2 H
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
According to Bohr's Model, which is not possible energy value of emitted photon by hydrogen atom :
If the temperature of cold junction of thermocouple is lowered, then the neutral temperature(a) Increases(b) Approaches inversion temperature(c) Decreases(d) Remains the same
If a charged body is moved in an electric field against the Coulomb force, then ________?
Two lenses of power + 12 and – 2 diopters are placed in contact. The combined focal length of the combination will be(a) 8.33 cm(b) 1.66 cm(c) 12.5 cm(d) 10 cm
The graph which represents the correct variation of logarithm of activity $(\log\ A)$ versus time, in figure is
→A metal cube is placed in an empty vessel. When water is filled in the vessel so that the cube is completely immersed in the water, the force on the bottom of the vessel in contact with the cube.
- Will increase.
- Will decrease.
- Will remain the same.
- Will become zero.
The strength of the magnetic field at a point $r$ near a long straight current carrying wire is $B .$ The field at a distance $\frac{ r }{2}$ will be
→Assertion : The phenomenon of X-ray production is basically inverse of photoelectric effect.
Reason : X-rays are electromagnetic waves.(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.
Reason : X-rays are electromagnetic waves.(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.
$ABC$ is a right angled triangle in which $AB = 3 \ cm$ and $BC = 4 \ cm$. And $\angle ABC = \pi/2.$ The three charges $+15, +12$ and $-20\ e.s.u.$ are placed respectively on $A, B$ and $C.$ The force acting on $B$ is
→In case of electrons and photons having the same wavelength. What is same for them?