Question 1

What is the SI unit of magnetic flux?

Accepted Answer

The SI unit of magnetic flux is Weber (Wb), which is equivalent to tesla-meter squared (T·m²) or volt-second (V·s).

Question 2

Lenz's law is a consequence of the conservation of which physical quantity?

Accepted Answer

Lenz's law is a direct consequence of the law of conservation of energy. It ensures that the induced current opposes the change in magnetic flux that produces it, preventing the creation of energy out of nothing.

Question 3

The dimensional formula of self-inductance is:

Accepted Answer

The dimensional formula of self-inductance is ML²T⁻²A⁻². This can be derived from the formula $E = -L \frac{dI}{dt}$ or $U = \frac{1}{2}LI^2$.

Question 4

Faraday's law of electromagnetic induction states that the magnitude of the induced emf is proportional to:

Accepted Answer

According to Faraday's law, the magnitude of the induced electromotive force is directly proportional to the rate of change of magnetic flux linked with the circuit, given by $e = -\frac{d\Phi}{dt}$.

Question 5

What is the unit of self-inductance?

Accepted Answer

The SI unit of self-inductance is Henry (H), which is equal to Weber per Ampere (Wb/A) or Volt-second per Ampere (V·s/A).

Electromagnetic Induction — CBSE Class 12 Physics Important Questions & Revision Notes