A wire is stretched to half of original radius the
resistance of stretched wire becomes.
(1) 4 times
(2) 8 times
(3) 16 times
(4) 32 times
Answers
Answered by
2
Answer:
1) 4 times
Explanation: Because when cross section decreases length increases i.e the wire is stretched and area of cross section is decreased to half
Answered by
2
When a wire is stretched to half of the original radius, then the resistance of stretched wire becomes (1) 4 times.
Resistance= Resistivity × length/area
On stretching the wire to double length, the cross section area is reduced to half.
Therefore,
New Resistance = Resistivity × 2 × length/area/2
Resistivity × length/area)x4
= Resistance × 4
Thus, on stretching the wire, resistance is multiplied by four times.
Similar questions