Question

Are my answers correct? If not can you please correct them? If the length of a...

Are my answers correct? If not can you please correct them?

If the length of a wire is doubled and radius is halved, how would the new value of resistivity (ρ) of this wire compare with the initial value?

A: 1/8 * the initial value

Why does a ring launcher launch a ring higher when the ring is dipped in liquid nitrogen?

A: because the resistance decreases

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