12. A copper wire of diameter 1 cm had a resistance of 0.15 Q. It was drawn under pressure so that its diameter was reduced to 50%. What is the new resistance of the wire ? * O 3.87 Q O 1.220 O 0.767 Q O 2.4 Q
12. A copper wire of diameter 1 cm had a resistance of 0.15 Q. It was drawn under pressure so that its diameter was reduced to 50%. What is the new resistance of the wire ? * O 3.87 Q O 1.220 O 0.767 Q O 2.4 Q
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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@12&23
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![12. A copper wire of diameter 1
cm had a resistance of 0.15 Q.
It was drawn under pressure
so that its diameter was
reduced to 50%. What is the
new resistance of the wire ? *
O 3.87 0
O 1.220
O 0.767 Q
O 2.4 N](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F482a1f04-b402-4bbe-8c82-72e2053c1174%2Fc807a37e-672e-445d-951a-af388fbdd954%2Fqe1j6kdn_processed.jpeg&w=3840&q=75)
Transcribed Image Text:12. A copper wire of diameter 1
cm had a resistance of 0.15 Q.
It was drawn under pressure
so that its diameter was
reduced to 50%. What is the
new resistance of the wire ? *
O 3.87 0
O 1.220
O 0.767 Q
O 2.4 N
![23. A coil of copper wire has
resistance of 90 Q at 20°C and
is connected to a 230 V supply.
By how much must the voltage
be increased in order to
maintain the current constant
if the temperature of the coil
rises to 60°C? Take for copper
aO = 0.00428/°C. *
O 28.6 V
O 55.9 V
O 40.2 V
O 36.3 V](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F482a1f04-b402-4bbe-8c82-72e2053c1174%2Fc807a37e-672e-445d-951a-af388fbdd954%2Falgvpx6_processed.jpeg&w=3840&q=75)
Transcribed Image Text:23. A coil of copper wire has
resistance of 90 Q at 20°C and
is connected to a 230 V supply.
By how much must the voltage
be increased in order to
maintain the current constant
if the temperature of the coil
rises to 60°C? Take for copper
aO = 0.00428/°C. *
O 28.6 V
O 55.9 V
O 40.2 V
O 36.3 V
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