Two identical loops , one of copper and the other of aluminium , are rotated with the same angular speed in the magnetic field . Compare (i) the induced emf and (ii) the current produced in the two coils .
Justify your answer .

Explanation

To solve the problem, we will analyze the induced electromotive force (emf) and the current produced in two identical loops made of copper and aluminum, which are rotated in a magnetic field at the same angular speed.

### Step-by-Step Solution:

**Step 1: Understanding Induced EMF**
The induced emf (E) in a loop can be calculated using Faraday's law of electromagnetic induction, which states:
\[ E = -\frac{d\Phi}{dt} \]
where \(\Phi\) is the magnetic flux given by:
...