57. When iron-hulled naval ships are built, the location of the shipyard and the orientation of the ship in the shipyard are recorded on a brass plaque permanently attached to the ship. Why

Explanation:

The ship magnetic field varies due to the location of the ship and their orientation. So the iron hulled can be use to detect the location of the ship if hijacked, stolen or lost.

The iron acquires a small net magnetization in the direction of the applied field. The iron hull align with the earth magnetic field and this create a weak magnetic field though as permanent magnet and this perturb magnetic compasses is use to aboard the ship.

So we can use this to identity the location of shipyard and which a stolen ship was built by its residual magnetic field.

explanation:

the president, prime minister, chief justice, speakers and ministers take their oath of office. the oath is taken in bengali

hey there,

the three main types of greek temples are

1 - doric

2 - ionic

3 - corinthian

best of luck,

- i.a -