Electricity Tes...

Two resistance are connected in series as shown in diagram. What is the value of $$R$$?

In a circuit two or more cells of the same e.m.f. are connected in parallel in order to

Five resistors each of $$1\ ohm$$ are connected in parallel. The resultant resistance of the combination is

Two resistances are connected in series as shown in the diagram. What is the current through $$R$$?

Resistance of $$2\ \Omega$$ and $$3\ \Omega$$ are connected in series. If the potential difference across the $$2\ \Omega$$ resistor is $$3\ V$$, the potential difference across $$3\Omega$$ is:

If the length of a material changes 4 times and area changes 2 times. Then the resistivity of the material will be changing 

An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If the lengths and radii of the wires are in the ratio of $$4/3$$ and $$2/3$$, then the ratio of the currents passing through the wire will be

A resistor of $$6 k\Omega $$ with tolerance $$10$$% and another of $$4k\Omega $$ with tolerance $$10$$% are connected in series. The tolerance of combination is about

The resistance of the series combination of two resistances is S. When they are joined in parallel the total resistance is P. If S = nP, then the minimum possible value of n is

The resistance of one ohm is very approximately equal to  that of a column of mercury $$1.06 m$$ long and of uniform cross-section of one hundredth of $$1\ cm^2$$. Find the resistivity of mercury.