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

Differentiate between Analog and Digital communication. 

State how a moving coil galvanometer can be converted into an ammeter.

Explain the significance of a radial magnetic field when a current-carrying coil is kept in it. 

Answer the following question.
Derive an expression for the electric field at any point on the equatorial line of an electric dipole. 

Define the term ‘current sensitivity’ of a moving coil galvanometer.

An electric dipole is placed at an angle of 30° with an electric field intensity of 2 × 10⁵ N/C. It experiences a torque equal to 4 Nm. The charge on the dipole, if the dipole length is 2 cm, is ______.

A galvanometer coil has a resistance of 12 Ω and the metre shows full scale deflection for a current of 3 mA. How will you convert the metre into a voltmeter of range 0 to 18 V?

A galvanometer coil has a resistance of 15 Ω and the metre shows full scale deflection for a current of 4 mA. How will you convert the metre into an ammeter of range 0 to 6 A?

Work done by a uniform electric field 'E' in moving a charge 'q' at a distance 'd' from a to b is ______.

An electric dipole is placed at an angle of 30° to a non-uniform electric field. The dipole will experience ________.

A conic surface is placed in a uniform electric field E as shown in the figure such that the field is perpendicular to the surface on the side AB. The base of the cone is of radius R, and the height of the cone is h. The angle of the cone is θ.

Find the magnitude of the flux that enters the cone's curved surface from the left side. Do not count the outgoing flux (θ < 45°)

The AC voltage across a resistance can be measured using a ______.