Question

1. Two copper wires A and B of length 30m and com have radius 2mm and imm
respectively. Compare the resistance of the two wires. Which will have less resistance?
2. Resistance of a metal wire of length 1m is 26ohm at 20°C. If the diameter of the wire is
0.3mm, what will be the resistivity of the metal at that temperature.
3. A nichrome wire has a resistance of 10ohm. Find the resistance of another nichrome wire,
whose length is three times and area of cross - section four times the first wire.
4. A wire of resisivity stretched to double its length. What will be its new resistiviy?
5. A copper wire of esistivity (is stretched to reduce its diameti x to half of its previous
value. What will be the new resistivity?
6. Two wires one of copper and other of manganese have equal lengths and equal
resistances. Which is thicker?(Given the resistivity of manganese is lower than that of
copper)
7. A copper wire has diameter 0.5mm and resistivity of 1.6x10ohm-m. What will be the
length of this wire to make its resistance 10ohm? How much does the resistance change if
the diameter is doubled.
8. The resistivity of copper at room temperature is 1.72x10ohm-centimeter. What is the
resistance of a copper wire 351a long and 0.025cm in cross-section.
9. The resistance of a wire of length 100cm and of uniform cross-section 0.020cm² is found
to be 2.0ohm. Calculate specific resistance of wire.
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Answer 1

Too long question and I am really sorry for this.

Answer 2

Answer:

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