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Assertion: In a region, where uniform electric field exists, the net charge within volume of any size is zero. Reason: The electric flux within any closed surface in a region of uniform electric field is

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Choose the incorrect statement. Equipotential

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A parallel plate capacitor is charged by a battery which is then disconnected. A dielectric slab is then inserted to fill the space between the plates. Match the changes that could occur with Column II. Column I Column II A. Charge on the capacitor plates p. Decrease by a factor of K B. Intensity of electric field q. Increase by a factor of K C. Energy stored r. Remains same D. Capacitance s. None

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Assertion: If the distance between parallel plates of a capacitor is halved and dielectric constant is made three times, then the capacitance becomes 6 times. Reason: Capacity of the capacitor depends upon the nature of the material between the

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Equipotential SurfaceIn physics, the region in space where every point in it is at the same potential, is called equipotential or isopotential. An equipotential region of a scalar potential in three-dimensional space is often an equipotential surface, but it can also be a three-dimensional region in space. The gradient of the scalar potential is everywhere perpendicular to the equipotential surface, and zero inside a three-dimensional equipotential region. In case of electrical conductors, if a and b are any two points within or at the surface of a given conductor, and given there is no flow of charge being exchanged between

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Wheatstone Bridge In 1845 by German physicist Gustav Kirchhoff described Kirchhoff’s circuit laws which are two equalities that deal with the current and potential difference (commonly known as voltage) in the lumped element model of electrical circuits.As an application of these laws, consider the circuit shown below, which is called the Wheatstone bridge. This bridge consists of four resistors `R_1, R_2, R_3 and R_4`. Across one pair of diagonally opposite points (A and C in the figure) a source is connected.This (i.e., AC) is called the battery arm. Between the other two vertices, B and Z), a galvanometer G (which

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Magnetic Field of a SolenoidMohan tightly wound a very long copper wire on a PVC pipe and carefully took the pipe out. The two ends of the copper wire then attached to a battery. This cylindrical shape of copper wire showed few properties of a bar magnet. Later he found that it is called a solenoid and this solenoid is used in several devices such as door bell, relay switch etc. The magnetic field of a solenoid is given below.The magnetic field strength of a solenoid having n turns is `B=mu_0nl`, where, `I` is the current flowing in the solenoid.The

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The earth takes 24 h to rotate once about its axis. How much time does the sun take to shift by 1º when viewed from the

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In what way does the corrective lens help the above person? Does the lens magnify very distant objects? Explain

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The above person prefers to remove his spectacles while reading a book. Explain

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A prism is made of glass of unknown refractive index. A parallel beam of light is incident on a face of the prism. The angle of minimum deviation is measured to be 40°. What is the refractive index of the material of the prism? The refracting angle of the prism is 60°. If the prism is placed in water (refractive index 1.33), predict the new angle of minimum deviation of a parallel beam of

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A beam of light converges at a point P. Now a lens is placed in the path of the convergent beam 12cm from P. At what point does the beam converge if the lens is a convex lens of focal length

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A man with normal near point (25 cm) reads a book with small print using a magnifying glass: a thin convex lens of focal length 5 cm. What is the maximum and the minimum angular magnification (magnifying power) possible using the above simple

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An object AB is kept in front of a concave mirror as shown in the figure.(i) Complete the ray diagram showing the image formation of the object. (ii) How will the position and intensity of the image be affected if the lower half of the mirror's reflecting surface is painted

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Find the radius of curvature of the convex surface of a plano-convex lens, whose focal length is 0.3 m and the refractive index of the material of the lens is 1 .5

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(i) What is the relation between critical angle and refractive index of a material? (ii) Does critical angle depend on the colour of light?

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The mixture a pure liquid and a solution in a long vertical column (i.e, horizontal dimensions << vertical dimensions) produces diffusion of solute particles and hence a refractive index gradient along the vertical dimension. A ray of light entering the column at right angles to the vertical is deviated from its original path. Find the deviation in travelling a horizontal distance d << h, the height of the

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What speed should a galaxy move with respect to us so that the sodium line at 589.0 nm is observed at 589.6

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What is the effect on the interference fringes in a Young’s double-slit experiment due to: the screen is moved away from the plane of the

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What is the effect on the interference fringes in a Young’s double-slit experiment due to: the source slit is moved closer to the double-slit

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