In a potentiometer experiment, the balancing length for a cell was found to be 1.20 m. Now, a resistance of 10  is connected across the terminals of this cell and the balancing length becomes 80 cm. The internal resistance of this cell is

Anonymous User Physics Current Electricity 06 May, 2020 1 Answer 129 views





Let  be the charge density distribution for a solid sphere of radius R and total charge Q. For a point ‘p’ inside the sphere at distance r1 from the centre of the sphere, what will be the magnitude of electric field? 

Anonymous User Physics Electrostatic 06 May, 2020 1 Answer 63 views


In an optics experiment, with the position of the object fixed, a student varies the position of a convex lens and for each position, the screen is adjusted to get a clear image of the object. A graph between the object distance u and the image distance v, from the lens, is plotted using the same scale for the two axes. A straight line passing through the origin and making an angle of 45° with the x-axis meets the experimental curve at P. What will be the coordinates of P?

Anonymous User Physics Ray Optics 06 May, 2020 1 Answer 62 views




In the Young's double slit experiment, when a glass plate ( = 1.5) of thickness t is introduced in the path of one of the interfering beams (wavelength = ), the intensity at the position where central maxima occurred previous remains unchanged. The minimum thickness of the glass plate is

Anonymous User Physics Wave Optics 05 May, 2020 1 Answer 58 views


 In a Young's double slit experiment, 12 fringes are observed to be formed in a certain segment of the screen when light of wavelength 600 nm is used. If the wavelength of light is changed to 400 nm, number of fringes observed in the same segment of the screen is given by

Anonymous User Physics Wave Optics 05 May, 2020 1 Answer 60 views








The above is a plot of binding energy per nucleon Eb, against the nuclear mass M; A, B, C, D, E, F correspond to different nuclei. Consider four reactions:

where ε is the energy released? In which reactions is ε positive?

Anonymous User Physics Atomic Physics 05 May, 2020 1 Answer 71 views

A piece of wire is bent in the shape of a parabola y = kx2 (y-axis vertical) with a bead of mass m on it. The bead can slide on the wire without friction. It stays at the lowest point of the parabola when the wire is at rest. The wire The wire is now accelerated parallel to the x-axis with a constant acceleration a. The distance of the new equilibrium position of the bead, where the bead can stay at rest w.r.t. the wire, from the y-axis is

Anonymous User Physics Laws of Motion and Friction 04 May, 2020 1 Answer 110 views







When a lift is moving upward with acceleration of 5 m/s2 then percentage change in the weight of the person in the lift is x%. If the lift is moving down with acceleration 5 m/s2 then percentage change in the weight of
same person is y%. Then the ratio x/y is (g = 10 m/s2)

Anonymous User Physics Laws of Motion and Friction 04 May, 2020 1 Answer 311 views