QJEEM25Ph08b4: JEE Main 2025 Physics - Class 12 JEEM25Ph08b4 Solution: Match List - I with List - II. List - I List - II (A) Magnetic…

(A) The unit "gauss" is used to measure magnetic induction, also known as magnetic flux density, within the CGS system of units.

$$B=\frac{\varphi }{A}=\frac{maxwell}{c{m}^2}=gauss(CGS)$$

(B) Magnetic intensity (H) is defined as the product of the number of turns per unit length in a coil (n) and the current that it carries (I).

i.e. $$H=nI=\frac{N}{L}I$$

Unit : A/m or Am $^{-1}$

(C) Magnetic flux, $$\varphi =BA$$

unit : weber

(D) Magnetic moment (M) : magnetic moment of a current loop, $$M=NIA$$

where, N = number of turns

I = current

A = Area

So, unit = Am $^2$

Hence, option A is correct.