A metal fish-shaped object of length 10 cm has a hollow space inside of it. It i

Question

A metal fish-shaped object of length 10 cm has a hollow space inside of it. It is initially electrically neutral. A point charge of magnitude q is placed 10 cm away from the fish’s “head.”
a. Is there any net charge induced on the fish?
b. Are any regions of the metal fish charged at all?
c. Is the inner surface of the hollow space inside the metal fish charged?
d. If q = 10 nC, what is the electric field magnitude at the tip of the fish head, 10 cm from the point charge? At the tail, 20 cm from the point charge?

Explanation / Answer

a) there is a charge induced but the net charge is still zero.

b) yes some parts of the fish are negatively charged while some are positively charged.

c) no, the inner surface is left uncharged as the net charge inside the hollow surface is zero and thus it acts as a electric shield.

d) at fish's tip E = 898 N/C

at the fish's tail E = 449 N/C

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