The drift velocity of free electron in a metal wire of a given potential gradient along it is Vd. If this potential gradient is doubled the new drift velocity will be

Anonymous User Physics Current Electricity 06 May, 2020 198 views

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 129 views

## A voltmeter has resistance 2000  and range 0-5 V. For increasing its range upto 20 V, a resistance of A voltmeter has resistance 2000 and range 0-5 V. For increasing its range upto 20 V, a resistance of

Anonymous User Physics Current Electricity 06 May, 2020 111 views

The current i through a given cross-section varies with time t as i = 3 + 2t, where i is in ampere and t is in second. The charge passed through this cross-section during t = 0 to t = 2 s is

Anonymous User Physics Current Electricity 06 May, 2020 126 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 63 views

A thin uniform rod of length l and mass m is swinging freely about a horizontal axis passing through its end. Its maximum angular speed is ω. What will be its centre of mass rises to maximum height?

Anonymous User Physics Circular and Rotational Motion 06 May, 2020 69 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 62 views

If x, v and a denote the displacement, the velocity and the acceleration of a particle executing simple harmonic motion of time period T, then, which of the following does not change with time?

Anonymous User Physics Oscillation 06 May, 2020 61 views

The logic circuit shown below has the input waveforms ‘A’ and ‘B’ as shown. Pick out the correct output waveform What will be the output?

Anonymous User Physics Electronic Devices 06 May, 2020 69 views

A p-n junction (D) shown in the figure can act as a rectifier. An alternating current source (V) is connected in the circuit. The current (I) in the resistor (R) can be shown by

Anonymous User Physics Electronic Devices 06 May, 2020 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 58 views

Four harmonic waves of equal frequencies and equal intensities I0 have phase angles . When they are superposed, the intensity of the resulting wave is . The value of n is

Anonymous User Physics Wave Optics 05 May, 2020 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 60 views

## In YDSE, d = , then the total no. of maxima observed upon screen will be In YDSE, d = , then the total no. of maxima observed upon screen will be

Anonymous User Physics Wave Optics 05 May, 2020 61 views

Young's double slit experiment is carried out by using green, red and blue light, one color at a time. The fringe widths recorded are , respectively. Then,

Anonymous User Physics Wave Optics 05 May, 2020 64 views

In the Young's double slit experiment using a monochromatic light of wavelength , the path difference (in terms of an integer n) corresponding to any point having half the peak intensity is

Anonymous User Physics Wave Optics 05 May, 2020 60 views

For destructive interference to take place between two monochromatic light waves of wavelength , the path difference should be

Anonymous User Physics Wave Optics 05 May, 2020 499 views

Two identical light waves, propagating in the same direction, have a phase difference . After they superpose, the intensity of the resulting wave will be proportional to

Anonymous User Physics Wave Optics 05 May, 2020 59 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 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 110 views

## What is the angle of friction between two surfaces in contact, if coefficient of friction is What is the angle of friction between two surfaces in contact, if coefficient of friction is Anonymous User Physics Laws of Motion and Friction 04 May, 2020 56 views

A block of mass 2 kg rests on the floor of an elevator, which is moving down with an acceleration ‘g’, then the apparent weight of the block is [take g = 10 m/s2]20

Anonymous User Physics Laws of Motion and Friction 04 May, 2020 291 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 311 views