Sign in
Please select an account to continue using cracku.in
↓ →
Join Our JEE Preparation Group
Prep with like-minded aspirants; Get access to free daily tests and study material.
Match List - I with List - II:
List - I List - II
a. Magnetic induction i. $$ML^2T^{-2}A^{-1}$$
b. Magnetic flux ii. $$M^0L^{-1}A$$
c. Magnetic permeability iii. $$MT^{-2}A^{-1}$$
d. Magnetization iv. $$MLT^{-2}A^{-2}$$
Choose the most appropriate answer from the options given below:
We have to match each physical quantity in List - I with its dimensional formula in List - II. Let us determine the dimensions one by one, showing every algebraic step.
(a) Magnetic induction $$\mathbf B$$
The force on a moving charge is $$\mathbf F = q\,\mathbf v \times \mathbf B.$$
Using the basic dimensions $$$[\mathbf F] = ML T^{-2},\; [q] = AT,\; [\mathbf v] = LT^{-1},$$$ we write
$$$[\mathbf B] \;=\; \frac{[\mathbf F]}{[q]\,[\mathbf v]}\;=\; \frac{MLT^{-2}}{(AT)\,(LT^{-1})}.$$$
Simplifying the powers of $$L$$ and $$T$$:
$$[\mathbf B] = M T^{-2} A^{-1}.$$
This matches List-II item $$\text{(iii)}\; M T^{-2} A^{-1}.$$
(b) Magnetic flux $$\Phi_B$$
By definition $$\Phi_B = \mathbf B \cdot \text{Area}.$$ Hence
$$$[\Phi_B] = [\mathbf B]\,[\text{Area}] = \left(M T^{-2} A^{-1}\right)\left(L^{2}\right).$$$
Multiplying, we obtain
$$[\Phi_B] = M L^{2} T^{-2} A^{-1}.$$
This corresponds to List-II item $$\text{(i)}\; M L^{2} T^{-2} A^{-1}.$$
(c) Magnetic permeability $$\mu$$
The relation between magnetic induction and magnetic field strength is $$\mathbf B = \mu\,\mathbf H.$$ Rearranging gives $$\mu = \mathbf B / \mathbf H.$$
We already have $$[\mathbf B] = M T^{-2} A^{-1}.$$ Field strength $$\mathbf H$$ is current per unit length, so $$[\mathbf H] = A L^{-1}.$$
Therefore
$$$[\mu] = \frac{M T^{-2} A^{-1}}{A L^{-1}} = M L T^{-2} A^{-2}.$$$
This is exactly List-II item $$\text{(iv)}\; M L T^{-2} A^{-2}.$$
(d) Magnetization $$\mathbf M$$
Magnetization is magnetic moment per unit volume. Magnetic moment is current times area, so $$[\text{moment}] = A L^{2}.$$ Dividing by volume $$L^{3}$$ gives
$$[\mathbf M] = \frac{A L^{2}}{L^{3}} = A L^{-1}.$$
Since no mass term appears, we may write
$$[\mathbf M] = M^{0} L^{-1} A^{1}.$$
This equals List-II item $$\text{(ii)}\; M^{0} L^{-1} A.$$
Collecting the matches:
$$$ \begin{aligned} \text{a}\;&\to\;\text{(iii)},\quad \text{b}\;&\to\;\text{(i)},\quad \text{c}\;&\to\;\text{(iv)},\quad \text{d}\;&\to\;\text{(ii)}. \end{aligned} $$$
Option B lists exactly this correspondence. Hence, the correct answer is Option B.
Create a FREE account and get:
Predict your JEE Main percentile, rank & performance in seconds
Educational materials for JEE preparation
Ask our AI anything
AI can make mistakes. Please verify important information.
AI can make mistakes. Please verify important information.