4 years ago

True or false materials that are poor conductors are poor insulaters

Physics

2 answers:

prohojiy [21]4 years ago

8 0

False, rubber is a poor conductor but is a good insulator.

myrzilka [38]4 years ago

6 0

This statement is false

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A solid conducting sphere with radius R carries a positive total charge Q. The sphere is surrounded by an insulating shell with

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Answer:

Explanation:

Volume of the insulating shell is,

$V_{shell}=\frac{4}{3}\pi(R^3_2-R^3_1)$

Charge density of the shell is,

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For 0 <r<R the electric field is zero, because the electric field inside the conductor is zero.

For R <r <2R According to gauss law

$E(4\pi r^2)=\frac{Q}{\epsilon_0}+\frac{4\pi\rho}{3\epsilon_0}(r^3-R^3)$

substitute $\rho=\frac{-3Q}{28\piR^3}$

$E=\frac{2}{7\pi\epsilon_0}\frac{Q}{r^2}-\frac{Qr}{28\piR^3}$

The net charge enclosed for each r in this range is positive and the electric field is outward

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19.21ms-¹

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that is the solution above

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