Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions for Physics

A point charge Q is placed at point 'O' as shown in the figure. Is the potential at point A, i.e. V_A, greater, smaller or equal to potential, V_B, at point B, when Q is (i) positive, and (ii) negative charge?

Find the intensity at a point on a screen in Young's double slit experiment where the interfering waves have a path difference of (i) λ/6, and (ii) λ/2. 

Using Biot-Savart law, deduce the expression for the magnetic field at a point (x) on the axis of a circular current carrying loop of radius R. How is the direction of the magnetic field determined at this point?

A point charge Q is placed at point O as shown in the figure. The potential difference V_A – V_B positive. Is the charge Q negative or positive?

Write the β-decay of tritium in symbolic form.

Use Biot-Savart's law to find the expression for the magnetic field due to a circular loop of radius 'r' carrying current 'I', at its centre ?

Plot a graph showing variation of current versus voltage for the material GaAs ?

Figure shows the field lines due to a positive point charge. Give the sign of potential energy difference of a small negative charge between the points Q and P.

Plot a graph showing the variation of photoelectric current with collector plate potential at a given frequency but for two different intensities I₁ and I₂, where I₂ > I₁.

A point charge (+Q) is kept in the vicinity of an uncharged conducting plate. Sketch the electric field lines between the charge and the plate?

Write three characteristic features to distinguish between the interference fringes in Young's double slit experiment and the diffraction pattern obtained due to a narrow single slit.

A parallel beam of light of wavelength 500 nm falls on a narrow slit and the resulting diffraction pattern is observed on a screen 1 m away. It is observed that the first minimum is a distance of 2.5 mm away from the centre. Find the width of the slit.

The figure shows the field lines on a positive charge. Is the work done by the field in moving a small positive charge from Q to P positive or negative? Give reason.

A heating element is marked 210 V, 630 W. What is the value of the current drawn by the element when connected to a 210 V dc source?

Derive the expression for the torque on a rectangular current carrying loop suspended in a uniform magnetic field.

A heating element is marked 210 V, 630 W. Find the resistance of the element when connected to a 210 V dc source.

Write two characteristics features distinguish the diffractions pattern from the interference fringes obtained in Young’s double slit experiment.

The graph shown in the figure represents a plot of current versus voltage for a given semiconductor. Identify the region, if any, over which the semiconductor has a negative resistance.

Write Einstein’s photoelectric equation?

point out any two characteristic properties of photons on which Einstein’s photoelectric equation is based ?