AIIMS 2019 Physics Magnetic Field in Solenoids MCQ Question

Option B is correct because it accurately represents the formula for calculating the induced magnetic field (B) around a current-carrying conductor, incorporating both the contributions from the magnetic field intensity (H) and the current (i) through the relationship B = μ₀(H + I), where μ₀ is the permeability of free space. Option A is incorrect as it misrepresents the relationship by adding current directly to the magnetic field intensity without proper context. Options C and D do not provide a valid expression for calculating the induced magnetic field; instead, they suggest substitution or equate it to a constant, which is not relevant to the formula needed for this calculation. Understanding these relationships is crucial for analyzing magnetic fields in electromagnetism.