a metallic wire of 200 ohms is streched to twice its lenth what will be its new resistance?
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0
Answer:
Explanation:
The new resistance of the wire becomes four times its old resistance. The wire's length is stretched to twice its length i.e. area of cross section decreases or becomes half, since volume remains the same.
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Answer:
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Explanation:
Original :
Length = l
Resistance = 200 ohm= rho*(l/a)
New:
Length = 2l
Hence, new resistance = rho*(2l/a)
=2(original resistance)
=2*200=400ohm
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