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Poonam Tripathi
Subject: Physics
, asked on 6/4/18
Ecperts plz tell me.. What is formula to find number of turns in a transformer... Plz tell fast i hv only 2 hrs in my exam.... Plzzzz urgent
Answer
1
Aparna Sahu
Subject: Physics
, asked on 4/4/18
Solve qus no. 55
Q.55 A gas undergoes a change according to the law: p =
${p}_{0}{e}^{\alpha v}$
, where
$\alpha $
is a constant. The bulk modulus of the gas is
(a) p
(b)
$\alpha $
pV
(c)
$\alpha $
p
(d)
${p}^{V}$
/
$\alpha $
Answer
1
Aparna Sahu
Subject: Physics
, asked on 4/4/18
Solve qus no. 46
Q.46. A particle executing S.H.M. has velocity 10 cm/s and 8 cm/s at distance 4 cm and 5 cm respectively. The period of oscillation of the particle, in seconds, is
(a)
$\frac{\mathrm{\pi}}{2}$
(b)
$\mathrm{\pi}$
(c) 2
$\mathrm{\pi}$
(d) 3
$\mathrm{\pi}$
/2
Answer
1
Mayank Deshpande
Subject: Physics
, asked on 26/3/18
A non –conducting rod AB of length l has a total charge q. The rod
is rotated about an axis passing through its center of mass with a
constant angular velocity as shown in the figure. The magnetic
moment of the rod is(qwl^2/24)
Answer
1
Shubhrajyoti Ghosh
Subject: Physics
, asked on 16/3/18
No links please
Q. Find the angular momentum of Bohr's
${2}^{nd}$
orbit.
Answer
1
Shubhrajyoti Ghosh
Subject: Physics
, asked on 15/3/18
No links please
17.
State and explain Brewster's laws. Find the Brewster angle for air to glass transmission. (R.I. of glass = 1.5) What is meant by resolving power of an optical instrument ? What will be the change of resolving power of a microscope when objective of the microscope is dipped in oil of high refractive index ?
Answer
1
Shubhrajyoti Ghosh
Subject: Physics
, asked on 15/3/18
No links please:
Q. Write the conditions for stable interference pattern of light. For which colours the fringe width is minimum is Young's double slit experiment ?
Answer
1
Shubhrajyoti Ghosh
Subject: Physics
, asked on 15/3/18
No links please
Q. Find the focal length of the projector-lens which projects the image of size
$60\times 60$
cm of a slide on a screen 2.4 m away, the slide being of the size
$3\times 3$
cm.
Light enters a prism of angle A at a grazing incidence to emerge at an angle
$\theta $
with the normal. Show that the refractive index of the material of the prism is given by,
$\mu ={\left\{1+{\left(\frac{\mathrm{cos}A+\mathrm{sin}\theta}{\mathrm{sin}A}\right)}^{2}\right\}}^{\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.}$
Answer
1
Shubhrajyoti Ghosh
Subject: Physics
, asked on 15/3/18
No links please
16. What is eddy current? Write an application of it. Define self inductance and mutual inductance. State the unit of self inductance.
[1 + 1 + 2 + 1]
Answer
1
Shubhrajyoti Ghosh
Subject: Physics
, asked on 15/3/18
No links please
7. (a)
What changes will occur to the interference fringe in Young's double slit experiment when
(i) distance between the slits is reduced and (ii) the whole system is immersed into water?
Answer
1
Shubhrajyoti Ghosh
Subject: Physics
, asked on 14/3/18
$\left(b\right)Thehorizontalcomponentofearth\text{'}smagneticfieldis0.4\times {10}^{-4}Wb/m2ataplacewiththeangleofdip30\xb0.Find\left(i\right)thevalueofverticalcomponentofearth\text{'}smagneticfieldand\left(ii\right)thetotalvalueofearth\text{'}smagneticfieldatthatplace.$
Answer
2
Nithyashrri Saravanan
Subject: Physics
, asked on 6/3/18
Dear experts how in problem 9 it neither intercepts both the components. Can u show with a diagram
Q Problem 9.
A vertical metallic pole falls down through the plane of the magnetic meridian. Will any emf be produced between its ends? Give reason for your answer.
Solution.
No emf will be induced because the metallic pole neither intercepts the horizontal component B
_{H}
nor the vertical component B
_{v}
of earth's magnetic field.
Answer
2
Ayesha Jahan
Subject: Physics
, asked on 4/3/18
"the axis of rotation of a ac generator is perpendicular to the field" If this happens then shouldnt be the flux zero because angle between field and area is 90 and cos90 is zero
Answer
1
Annabeth Chase
Subject: Physics
, asked on 3/3/18
A coil of self inductance of 0.5 H carries a current of 2A. The energy stored in joule is how much?
Answer
2
Kurian J
Subject: Physics
, asked on 2/3/18
explain how does an em wave exert pressure on the atmosphere ??
Answer
1
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What are you looking for?

Q.55 A gas undergoes a change according to the law: p = ${p}_{0}{e}^{\alpha v}$, where $\alpha $ is a constant. The bulk modulus of the gas is

(a) p

(b) $\alpha $pV

(c) $\alpha $p

(d) ${p}^{V}$/$\alpha $

Q.46. A particle executing S.H.M. has velocity 10 cm/s and 8 cm/s at distance 4 cm and 5 cm respectively. The period of oscillation of the particle, in seconds, is

(a) $\frac{\mathrm{\pi}}{2}$

(b) $\mathrm{\pi}$

(c) 2$\mathrm{\pi}$

(d) 3$\mathrm{\pi}$/2

is rotated about an axis passing through its center of mass with a

constant angular velocity as shown in the figure. The magnetic

moment of the rod is(qwl^2/24)

Q. Find the angular momentum of Bohr's ${2}^{nd}$ orbit.

17.State and explain Brewster's laws. Find the Brewster angle for air to glass transmission. (R.I. of glass = 1.5) What is meant by resolving power of an optical instrument ? What will be the change of resolving power of a microscope when objective of the microscope is dipped in oil of high refractive index ?Q. Write the conditions for stable interference pattern of light. For which colours the fringe width is minimum is Young's double slit experiment ?

Q. Find the focal length of the projector-lens which projects the image of size $60\times 60$ cm of a slide on a screen 2.4 m away, the slide being of the size $3\times 3$ cm.

Light enters a prism of angle A at a grazing incidence to emerge at an angle $\theta $with the normal. Show that the refractive index of the material of the prism is given by,

$\mu ={\left\{1+{\left(\frac{\mathrm{cos}A+\mathrm{sin}\theta}{\mathrm{sin}A}\right)}^{2}\right\}}^{\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.}$

16. What is eddy current? Write an application of it. Define self inductance and mutual inductance. State the unit of self inductance.

[1 + 1 + 2 + 1]

7. (a)What changes will occur to the interference fringe in Young's double slit experiment when(i) distance between the slits is reduced and (ii) the whole system is immersed into water?

Q Problem 9.A vertical metallic pole falls down through the plane of the magnetic meridian. Will any emf be produced between its ends? Give reason for your answer.Solution.No emf will be induced because the metallic pole neither intercepts the horizontal component B_{H}nor the vertical component B_{v}of earth's magnetic field.