Current Electri...

Statement I: In a meter-bridge experiment, the null point for an unknown resistance is measured. Now, the unknown resistance is put inside an enclosure maintained at a higher temperature. The null point can be obtained at the same point as before by decreasing the value of the standard resistance.
Statement II: Resistance of a metal increases with the increase in temperature.           

Express which of the following steups can be used to verify Ohm's law?

To verify Ohm's law, a student is provided with a test resistor $$R_T$$ a high resistance $$R_1$$, a small resistance $$R_2,$$ two identical galvanometer $$G_1$$ and $$G_2$$ and a variable voltage source V. The correct circuit to carry out the experiment is       

The temperature coefficient of resistance of a wire is $$0.00125$$ per $$^{0}C$$. At $$300 K$$, its resistance is $$1 \ ohm$$. This resistance of the wire will be $$2 \ ohm$$ at       

The equivalent resistance between $$A$$ and $$B$$ ( of the circuit as shown ) is 

Two cells of emf approximately 5V and 10V are to be accurately compared using a potentiometer of length 400cm.

Which is a wrong statement

Kirchhoff $$I$$ law and $$II$$ law of current, proves the 

The conductors of resistance $$1 \Omega, 2 \Omega$$ and $$3\Omega$$ are in series in a circuit. What is the equivalent resistance in the circuit ?

Two bulbs, one of 50 watt and another of 25 watt are connected in series to the mains. The ratio of the currents through them is