Electricity Tes...

Through a metallic conductor, electric current is considered to be due to movement of

If 5000 alpha particles per minute are passing through a straight tube of radius r, then the resulting electric current is (approximately)

The work done in moving a unit positive charge across two points in an electric circuit is a measure of

What will be the ratio of resistances of Aluminium and copper wire where resistivity of aluminium wire is twice the resistivity of copper wire and density of aluminium wire is one-third the density of copper wire and mass per unit length is same for aluminium and copper wire?

The heating element of an electric heater should be made with a material, which inherits the property of

Four equal resistances are connected as shown in the figure below. The resistance across AB will be

The effective resistance between the points A and B is

In the arrangement of resistances, shown in figure, the potential difference between B and D will be zero when the resistance X is

N identical cells are connected to form a battery. When the terminals of the battery are joined directly, current I flows in the circuit. Under what condition can we obtain the maximum value of I?

In a series combination of electrical appliances, total electric power

A positively charged particle moving due east enters a region of uniform magnetic field directed vertically upwards, the particle will

The working of a dynamo is based on the principle of

The output of a Transformer is:

To convert a galvanometer into an ammeter, which of the following should be done?

A current is flowing north along a power line. The direction of the magnetic field above it, neglecting the earth's field, is directed towards

Two particles, each of mass m and carrying charge Q, are separated by some distance. If they are in equilibrium under mutual gravitational and electrostatic forces, what is the order of Q/m?

The meter which measures the consumption of electric energy in houses is called a

The peak voltage of the AC supplied in India is

The value of internal resistance of an ideal cell is

A long magnetic needle of length L, having a magnetic moment M and pole strength m units, is broken into two at the middle. The magnetic moment and pole strength of each piece will be