CUET Preparation Today
An iron ring of relative permeability $μ_r$, is introduced inside a toroidal solenoid having $η$ turns per meter. If the current in the solenoid is I, then the magnetic field in the ring is: |
$\frac{μ_oμ_rI}{\sqrt{η}}$ $\frac{μ_oμ_rI}{η^2}$ $μ_oμ_rη^2I$ $μ_oμ_rηI$ |
$μ_oμ_rηI$ |
The correct answer is Option (4) → $μ_oμ_rηI$ Magnetic field inside a toroidal solenoid with an iron core: $B = \mu H = \mu_0 \mu_r H$ Magnetizing field $H$ of a solenoid: $H = \eta I$ Thus, magnetic field in the iron ring: $B = \mu_0 \mu_r \eta I$ Final Answer: $B = \mu_0 \mu_r \eta I$ |
