Electricity Tes...

If the resistance of a conductor in a given circuit is increased, then the current will

A wire has a resistance of 1 Ω. It is stretched to double its length. The resistance of the wire will be

When an electric heater is switched on, the current (i) flowing through it is plotted against time (t). Taking into account the variation of resistance with temperature, which of the following best represents the resulting curve?

What value must the resistor R₁ have in order that the resistance between the terminals A and B is R?

When a body is negatively charged by friction, it means the body has

A current of 5 amperes is flowing through a resistance. Charge appearing through the resistance per second is

The effective resistance between A and B is

In the circuit shown below, some potential difference is applied between A and B. If the equivalent resistance between A and B is R, then which of the following is correct?

An electric current from a battery of 6 V passes through a circuit having three lamps of resistances 2 , 3 and 4 joined in parallel. The current passing in the 4 lamp is

If a 60 W bulb is lit everyday for 5 hours, the consumption of energy in a month of 30 days will be

Two very long parallel wires carry equal currents in the same direction. They are found to attract each other with a force F. If the current in each wire is halved, the force of attraction will be

The induced emf produced when a magnet is inserted into a coil does not depend upon

The number of turns in the primary and the secondary coils of a transformer are 1000 and 3000, respectively. If the primary coil is connected to 80 volt ac, then potential difference per turn of the secondary coil is

R_S is the shunt resistance, ig is the maximum permissible current through galvanometer, Rg is resistance of galvanometer, and I is the current to be measured by the ammeter. R_s is given by

ABCD is a square loop made of a uniform conducting wire. A current enters the loop at A and leaves at D. The magnetic field is

A charge q is placed at the centre of the line joining two equal charges Q each. The system of the three charges will be in equilibrium, if q is equal to

The utility of a safety fuse in an electric circuit depends on its low

The peak voltage of the AC supplied in India is

Three cells of EMF 1.5 volts each and internal resistance of 1 ohm are connected in parallel. This combination is used to send current through an external resistance of 0.001 ohm. What is the value of the current?

If a piece of metal was thought to be a magnet, which one of the following observations would offer conclusive evidence?