BIO SPIDERWEB CONDUCTIVITY . Some types of spiders build webs that consist of threads made of dry silk coated with a solution of a variety of compounds. This coating leaves the threads, which are used to capture prey, hygroscopic —that is, they attract water from the atmosphere. It has been hypothesized that this aqueous coating makes the threads good electrical conductors. To test the electrical properties of coated thread, researchers placed a 5-mm length of thread between two electrical contacts* The researchers stretched the thread in 1-mm increments to more than twice its original length, and then allowed it to return to its original length, again in 1-mm increments. Some of the resistance measurements are shown in the table: *Based on F. Vollrath and D. Edmonds. “Consequences of electrical conductivity in an orb spider’s capture web.” Natunvissenschaften (100:12. December 2013, pp. 1163-69). 25.80 If the conductivity of the thread results from the aqueous coaling only, how does the cross-sectional area A of the coating compare when the thread is 13 mm long versus the starting length of 5 mm? Assume that the resistivity of the coaling remains constant and the coating is uniform along the thread. A 13mm is about (a) 1 10 A 5 mm ; (b) 1 4 A 5 mm ; (c) 2 5 A 5 mm ; (d) the same as A 5 mm .
BIO SPIDERWEB CONDUCTIVITY . Some types of spiders build webs that consist of threads made of dry silk coated with a solution of a variety of compounds. This coating leaves the threads, which are used to capture prey, hygroscopic —that is, they attract water from the atmosphere. It has been hypothesized that this aqueous coating makes the threads good electrical conductors. To test the electrical properties of coated thread, researchers placed a 5-mm length of thread between two electrical contacts* The researchers stretched the thread in 1-mm increments to more than twice its original length, and then allowed it to return to its original length, again in 1-mm increments. Some of the resistance measurements are shown in the table: *Based on F. Vollrath and D. Edmonds. “Consequences of electrical conductivity in an orb spider’s capture web.” Natunvissenschaften (100:12. December 2013, pp. 1163-69). 25.80 If the conductivity of the thread results from the aqueous coaling only, how does the cross-sectional area A of the coating compare when the thread is 13 mm long versus the starting length of 5 mm? Assume that the resistivity of the coaling remains constant and the coating is uniform along the thread. A 13mm is about (a) 1 10 A 5 mm ; (b) 1 4 A 5 mm ; (c) 2 5 A 5 mm ; (d) the same as A 5 mm .
BIO SPIDERWEB CONDUCTIVITY. Some types of spiders build webs that consist of threads made of dry silk coated with a solution of a variety of compounds. This coating leaves the threads, which are used to capture prey, hygroscopic—that is, they attract water from the atmosphere. It has been hypothesized that this aqueous coating makes the threads good electrical conductors. To test the electrical properties of coated thread, researchers placed a 5-mm length of thread between two electrical contacts* The researchers stretched the thread in 1-mm increments to more than twice its original length, and then allowed it to return to its original length, again in 1-mm increments. Some of the resistance measurements are shown in the table:
*Based on F. Vollrath and D. Edmonds. “Consequences of electrical conductivity in an orb spider’s capture web.” Natunvissenschaften (100:12. December 2013, pp. 1163-69).
25.80 If the conductivity of the thread results from the aqueous coaling only, how does the cross-sectional area A of the coating compare when the thread is 13 mm long versus the starting length of 5 mm? Assume that the resistivity of the coaling remains constant and the coating is uniform along the thread. A13mm is about (a)
1
10
A5 mm; (b)
1
4
A5 mm; (c)
2
5
A5 mm; (d) the same as A5 mm.
Technician A says that a conductor has 1 to 3 electrons orbiting in its outer valance ring.
Technician B says that an insulator has 4 electrons orbiting in its outer valance ring.
Who is correct? Or both?
Technician A says that a loose or corroded ground could cause a dimly lit bulb.
Technician B says that a loose or corroded ground could cause a blown fuse.
- C. Problems
C1. For the configuration of conductors depicted below, find
the electrodynamic force F2 = ? developed in conductor 2, given:
3
I =1000 A
L=2m
I,
I
I2
= 2500 A
а%3D2 ст
I3 = 3000 A
b= 6 cm
L
I4 = 5000 A
c = 4 cm
b
If the cable wire of my charger
is damaged exposing the
copper wire, I should cover it
with electrical tape because, *
The electrical tape is a conductor,
thus it will prevent the flow of
electricity from the copper wire
which is a conductor as well.
The electrical tape is an insulator,
thus it will prevent the flow of
electricity from the copper wire
which is an insulator as well.
The electrical tape is a conductor,
thus it will prevent the flow of
electricity from the copper wire
which is an insulator.
The electrical tape is an insulator,
thus it will prevent the flow of
electricity from the copper wire
which is a conductor.
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