1.A wire of
resistance R is bent in form of a closed circle, what is the resistance across
a diameter of the circle?
2. Two wires of equal
cross sectional area , one of copper and other of
Manganin have same resistance. Which one
will be longer?
3. A Rectangular
block of iron has dimensions L X L X b. What is the
resistance ofthe block measured between
the two square ends ? Given ρ=
resistivity.
4. Three equal
resistances are connected in series then in parallel. What will
be
the ratio of their Resistances?
5. Two cubes A and B
are of the same material. The side of B is thrice as that
of A.Find the ratio RA/RB.
6. A nichrome wire of
resistivity 100X10-6ohm- m and copper wire of
resistivity1.62X10-8 ohm-m of same length
and same area of cross section
are connected in series , current is
passed through them, why does the
nichrome wire gets heated first?
7. A parallel combination of
three resistances take a current of 7.5 A from a 30 V battery. If two
of the resistance values are 10 Ω and 12 Ω, find
the third.
8. A string of
fifty 15 ohm Christmas tree lights are connected in series. One burns out, they
all burn out. Calculate the total resistance.
9.
A 10 ohm, 20 ohm, and 100 ohm resistors are connected in parallel. Calculate
the total
resistance.
