Recent questions in Physics

Find the ratio of De-Broglie wavelength of molecules of hydrogen and helium which are at temperatures $\;27^{0} C \;and\; 127^{0} C \;$ respectively

asked Feb 21, 2014 by yamini.v

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An electron is accelerated by a potential difference of 50 Volt ., then the de-Broglie wavelength associated with it .

asked Feb 21, 2014 by yamini.v

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A particle is moving with velocity $ \hat i+ 3\hat j$ and it produces an electric field $ 2\hat k$ at a point. It will produce magnetic field at that point equal to

asked Feb 21, 2014 by thanvigandhi_1

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Sun gives light at rate of $\;1400 Wm^{-2}\;$ of area perpendicular to direction of light . Assume $\;\lambda\;$ (sun light )= $\;6000 A^{0}\;.$ Then no.of Photons emitted from sun/sec assuming average radius of earth's orbit is $\;1.49\times10^{11} m\;$ is

asked Feb 21, 2014 by yamini.v

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The amount of energy gained in half a revolution by an electron of mass m, velocity v and charge e in a uniform magnetic field is

asked Feb 21, 2014 by thanvigandhi_1

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Sun gives light at rate of $\;1400 Wm^{-2}\;$ of area perpendicular to direction of light . Assume $\;\lambda\;$ (sun light )= $\;6000 A^{0}\;.$ Then no.of Photons/sec arriving at $\;1m^2\;$ area at that part of earth is

asked Feb 21, 2014 by yamini.v

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The intensity of direct sunlight before it passes through the earth's atmosphere is $\;1.4 KW/m^2\;.$ If it is completely obsorved than the corresponding radiation pressure :

asked Feb 21, 2014 by yamini.v

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When a charged particle passes through a region of uniform magnetic field

asked Feb 21, 2014 by thanvigandhi_1

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Two observers moving with different velocities see that a point charge produces same magnetic field at a point $A$. Their relative velocity must be parallel to , $ \overrightarrow r$ where $ \overrightarrow r$ is the position vector of point $A$ w.r.t. the point charge. This statement is

asked Feb 21, 2014 by thanvigandhi_1

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A paramagnetic substance is kept in a weak magnetic field and its absolute temperature $T$ is increased. As a result, its magnetisation

asked Feb 21, 2014 by thanvigandhi_1

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A particle is projected perpendicular to a uniform magnetic field. The area bounded by the trajectory of the particle is directly proportional to

asked Feb 21, 2014 by thanvigandhi_1

2 answers

A current carrying loop in a magnetic field behaves like a

asked Feb 21, 2014 by thanvigandhi_1

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A wire of length $\ell$ carrying a current $i$ is bent to form a circle. Its magnetic moment is

asked Feb 21, 2014 by thanvigandhi_1

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The direction of magnetic lines of force produced by passing a direct current through a conductor is determined by

asked Feb 21, 2014 by thanvigandhi_1

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A proton moves in a circular path perpendicular to a magnetic field. If the intensity of the field is doubled and the radius of the circular path is constant, then the kinetic energy of the particle has

asked Feb 21, 2014 by thanvigandhi_1

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Which of the following statement is false for the equation $ \overrightarrow F = q( \overrightarrow V \times \overrightarrow B)$

asked Feb 21, 2014 by thanvigandhi_1

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Two protons whose velocities are in the ratio $4 : 1$, move perpendicular to a uniform magnetic field, the ratio of the radii of their paths will be

asked Feb 21, 2014 by thanvigandhi_1

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The intensity of the magnetic field due to a current carrying coil is maximum at

asked Feb 21, 2014 by thanvigandhi_1

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The intensity of the magnetic field at any point due to a current carrying element depends on

asked Feb 21, 2014 by thanvigandhi_1

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A constant current flows along the length of a thin-walled, infinitely long, cylindrical pipe. Then magnetic field

asked Feb 21, 2014 by thanvigandhi_1

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A particle of charge $q$ and mass $m$ moves in a circular orbit with radius $r$ and angular speed $ \omega$. The ratio of the magnitude of magnetic moment to its angular momentum depends on

asked Feb 21, 2014 by thanvigandhi_1

1 answer

An ionized gas contains both $+ve$ and $-ve$ ions. If an electric field is applied in the $+x$ direction and a magnetic field is applied in the $+z$ direction,

asked Feb 21, 2014 by thanvigandhi_1

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A right angle prism $(45^{\circ} - 90^{\circ}- 45^{\circ})$ of refractive index n has a plate of refractive index $n_1\;( n_1 < n ) $ to its diagonal wall. The assembly is in air. A ray is incident at AB . Then the angle of incidence at AB for which the ray strikes the diagonal face at critical angle is :-

asked Feb 20, 2014 by meena.p

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In YDSE intensity at a point is $\bigg (\large\frac{1}{4} \bigg) $ of maximum intensity. Angular position of this point is :

asked Feb 20, 2014 by meena.p

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A solid metallic sphere of radius a is surrounded by a conducting spherical shell of radius b $\;(b >a)\;$ . The solid sphere is given a charge Q . Potential at the surface of the solid sphere is $\;V_{a}\;$ and at the surface of spherical shell is $\;V_{b}\;$. If we put -4Q charge on the shell the potential differance between the sphere and shell becomes $\;\bigtriangleup V\;.$ Now we earthed the outer shell and the charge on the ouer shell is $\;q_{1}\;$.Now we removed the earthing connection from the shell and earthed the inner solid sphere. Charge on solid sphere becomes $\;q_{2}\;$. Answer the following question based on the passage.Now if we connected the shell and solid sphere after removing earthing from the solid sphere charge on outer surface of shell becomes.

asked Feb 20, 2014 by yamini.v

1 answer

A solid metallic sphere of radius a is surrounded by a conducting spherical shell of radius b $\;(b >a)\;$ . The solid sphere is given a charge Q . Potential at the surface of the solid sphere is $\;V_{a}\;$ and at the surface of spherical shell is $\;V_{b}\;$. If we put -4Q charge on the shell the potential differance between the sphere and shell becomes $\;\bigtriangleup V\;.$ Now we earthed the outer shell and the charge on the ouer shell is $\;q_{1}\;$.Now we removed the earthing connection from the shell and earthed the inner solid sphere. Charge on solid sphere becomes $\;q_{2}\;$. Answer the following question based on the passage. $\;q_{2}\;$ is

asked Feb 20, 2014 by yamini.v

1 answer

In YDSE if the source consists of two wave lengths $\lambda_1=4000 \;a^{\circ}$ and $\lambda _2 =4002\;A^{\circ}$ . Find the distance from centre where fringes disappear if $d= 1\;cm; D=1\;m$

asked Feb 20, 2014 by meena.p

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A solid metallic sphere of radius a is surrounded by a conducting spherical shell of radius b $\;(b >a)\;$ . The solid sphere is given a charge Q . Potential at the surface of the solid sphere is $\;V_{a}\;$ and at the surface of spherical shell is $\;V_{b}\;$. If we put -4Q charge on the shell the potential differance between the sphere and shell becomes $\;\bigtriangleup V\;.$ Now we earthed the outer shell and the charge on the ouer shell is $\;q_{1}\;$.Now we removed the earthing connection from the shell and earthed the inner solid sphere. Charge on solid sphere becomes $\;q_{2}\;$. Answer the following question based on the passage.$\;q_{1}\;$ is

asked Feb 20, 2014 by yamini.v

1 answer

Two monochromatic coherent sources of wavelength 5000 A are placed along line normal to screen as shown. Then the condition for maxima at the point P is :

asked Feb 20, 2014 by meena.p

1 answer

A solid metallic sphere of radius a is surrounded by a conducting spherical shell of radius b $\;(b >a)\;$ . The solid sphere is given a charge Q . Potential at the surface of the solid sphere is $\;V_{a}\;$ and at the surface of spherical shell is $\;V_{b}\;$. If we put -4Q charge on the shell the potential difference between the sphere and shell becomes $\;( \bigtriangleup V )\;.$ Now we earthed the outer shell and the charge on the ouer shell is $\;q_{1}\;$.Now we removed the earthing connection from the shell and earthed the inner solid sphere. Charge on solid sphere becomes $\;q_{2}\;$. Answer the following question based on the passage. Potential difference $\;(\bigtriangleup V) \;$ measured between the inner solid sphere and outer shell after putting a charge -4Q is

asked Feb 20, 2014 by yamini.v

1 answer

A light ray enters into a medium whose refractive index varies along x-axis as $y(x) = \mu_{circ} \sqrt {1+ 0.25 x}.$ Where $\mu_0=1$.The medium is bounded by the planes $x=0,x=1\;cm$ and $y=0$ . If the ray enters at an angle $\theta=30^{\circ}$ with horizontal . Then the trajectory of light ray is

asked Feb 20, 2014 by meena.p

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Two particles $ X$ and $Y$ equal charges enter a region of uniform magnetic field after being accelerated through the same potential difference and describe circular paths of radii $R_X$ and $R_Y$ respectively. The ratio of their masses is

asked Feb 19, 2014 by thanvigandhi_1

1 answer

The ratio of the magnetic field at the centre of a current carrying coil to its magnetic moment is $ x$. If the current and the radius are both doubled, the new ratio will become

asked Feb 19, 2014 by thanvigandhi_1

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If a magnetic needle is kept in a non-uniform magnetic field, it experiences

asked Feb 19, 2014 by thanvigandhi_1

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Four point charges $\;+8 \mu C\;,-1 \mu C\;,-1 \mu C\;and\;+8 \mu C\;$ are fixed at the points $\;-\sqrt{\large\frac{27}{2}} m \;,- \sqrt{\large\frac{3}{2}} m \;,+ \sqrt{\large\frac{3}{2}} m \;and\;+\sqrt{\large\frac{27}{2}} m\;$ respectively on the Y-axis . A particle of mass $\;6\times10^{-4} kg\;$ and charge $\;0.1 \mu C \;$ moves along the - X direction . It's speed at $\;x=+ \infty\;$ is $\;V_{0}\;. \quad \;$ Answer the following question based on the passage. Kinetic energy of the particle at origin would be

asked Feb 19, 2014 by yamini.v

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In the ideal YDSE when a glass plate (RI= 1.5) of thickness t is introduced in path of one of interfering beams , the intensity at the position where central maximum occurred previously remains unchanged. The minimum thickness of glass plate is :

asked Feb 19, 2014 by meena.p

1 answer

A hollow double concave lens is made of very thin transparent material It can be filled with air or either of two liquids $L_1$ or $L_2$ having refracting indices $n_1$ and $n_2$ respectively $( n_2 > n_1 > 1)$ The lens will diverge a parallel beam of light if it is filled with

asked Feb 19, 2014 by meena.p

1 answer

A coil having $N$ turns is wound tightly in the form of a spiral with inner and outer radii as $a$ and $b$ respectively. The magnetic field at the centre when a current $i$ passes through it is

asked Feb 19, 2014 by thanvigandhi_1

1 answer

A particle of charge $q$ and mass $m$ is moving with a constant velocity v along $+x$ - axis. It enters a region of constant magnetic field along $-z$ - axis from $x = a$ to $x = b$. The minimum value of $ v$ required so that the particle can enter the region $x>b$ is

asked Feb 19, 2014 by thanvigandhi_1

1 answer

Four point charges $\;+8 \mu C\;,-1 \mu C\;,-1 \mu C\;and\;+8 \mu C\;$ are fixed at the points $\;-\sqrt{\large\frac{27}{2}} m \;,- \sqrt{\large\frac{3}{2}} m \;,+ \sqrt{\large\frac{3}{2}} m \;and\;+\sqrt{\large\frac{27}{2}} m\;$ respectively on the Y-axis . A particle of mass $\;6\times10^{-4} kg\;$ and charge $\;0.1 \mu C \;$ moves along the - X direction . It's speed at $\;x=+ \infty\;$ is $\;V_{0}\;. \quad \;$ Answer the following question based on the passage. Find the least value of $\;V_{0}\;$ for which the particle will cross the origin .

asked Feb 19, 2014 by yamini.v

1 answer

A short linear object of length b lies along the axis of a concave mirror of focal length f at a distance u from pole of mirror , The size of image is approximate equal to :

asked Feb 19, 2014 by meena.p

1 answer

In the YDSE apparatus shown the ratio of maximum to minimum intensity on screen is 9. The wavelength of light used is $\lambda$, the value of y is :

asked Feb 19, 2014 by meena.p

1 answer

Four point charges $\;+8 \mu C\;,-1 \mu C\;,-1 \mu C\;and\;+8 \mu C\;$ are fixed at the points $\;-\sqrt{\large\frac{27}{2}} m \;,- \sqrt{\large\frac{3}{2}} m \;,+ \sqrt{\large\frac{3}{2}} m \;and\;+\sqrt{\large\frac{27}{2}} m\;$ respectively on the Y-axis . A particle of mass $\;6\times10^{-4} kg\;$ and charge $\;0.1 \mu C \;$ moves along the - X direction . It's speed at $\;x=+ \infty\;$ is $\;V_{0}\;. \quad \;$ Answer the following question based on the passage . Find the point on the x-axis where electric field is zero .

asked Feb 19, 2014 by yamini.v

1 answer

An object is placed at $ A\;(OA > f)$ Here, f is the focal length of the lens. The image is formed at B, A perpendicular is erected at 0 and C is chooses such that $\angle BCA =90^{\circ}$. Let $OA=a,OB=b$ and $OC=c$ then f is :

asked Feb 19, 2014 by meena.p

1 answer

A charged particle enters a magnetic field with the velocity vector making a $45^{\circ}$ magnetic field. If the pitch of the helical path followed by the particle is $\wp$, its radius will be angle with the

asked Feb 19, 2014 by thanvigandhi_1

1 answer

A point object O is placed at a distance o 20cm from a convex lens of focal 10 cm as shown. At what distance x from lens should a concave mirror of focal length 60 cm can be placed so that final image coincides with object.

asked Feb 19, 2014 by meena.p

1 answer

Net magnetic field at the centre of the circle $O$ due to a current carrying loop as shown in the figure for $ \theta < 180^{\circ}$ is

asked Feb 19, 2014 by thanvigandhi_1

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The dimensions of magnetic flux are

asked Feb 19, 2014 by thanvigandhi_1

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Optic axis of a thin equiconvex lens is the x-axis. The co-ordinates of a point object and its image are $(-40\;cm,1\;cm)$ and $(50\;cm,-2\;cm)$ respectively . lens is located at

asked Feb 19, 2014 by meena.p

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A charge $q$ moves along the $x$-axis with a velocity of 5 m/s in a uniform magnetic field $ \overrightarrow B = \hat i + \hat j + \hat k$ The force experienced by the charge will be

asked Feb 19, 2014 by thanvigandhi_1

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