Question

A metal plate is getting heated. It can be because

• A. a current (either direct or alternating) is passing through the plate.
• B. a direct current is passing through the plate.
• C. it is placed in a space varying magnetic field but does not vary with time.
• D. it is placed in a time varying magnetic field.

Answer 1

Answer: (A), (B), (D)

it is placed in a time varying magnetic field.

Formula used: $H=I^{2}Rt$

As we know metal plate is conducting material, so it’s heating effect due to current is given by, $H=I^{2}Rt$

Here, $I=current$

$R=resistance$

$t=time$

So, the metal plate will get heat due to current either direct or alternating passing through the plate.

Also, in presence of time varying magnetic field there will be induced current and this current heats the metal plate.

Therefore, $\left(a\right),\left(b\right)$ and $\left(d\right)$ are correct options.

Final answer: Option (a), (b), (d)