A ferromagnetic substance becomes a permanent magnet when it is placed in a magnetic field because:

Options

A. all the domains get oriented in the direction of magnetic field
B. all the domains get oriented in the direction opposite to the direction of magnetic field
C. domains get oriented randomly
D. domains are not affected by magnetic filed

Answer

B

Explanation

In the presence of magnetic field, all thedomains of a ferromagnetic substance get oriented in the direction of magnetic field. That's why it becomes a permanent magnet .