JEE Main 2022 (30 Jun, Shift 1) Physics Q39: Biot-Savart Law

Question

A coil of n number of turns wound tightly in the form of a spiral with inner and outer radii $\mathrm{r_1}$ and $\mathrm{r_2}$ respectively. When a current of strength I is passed through the coil, the magnetic field at its centre will be :

Accepted Answer

Option 4: $\frac{\mu_0 nI}{2(r_2 - r_1)}\log_e\frac{r_2}{r_1}$

Answer

$\frac{\mu_0 nI}{2(r_2 - r_1)}$

Answer

$\frac{\mu_0 nI}{r_2}$

Answer

$\frac{\mu_0 nI}{r_2 - r_1}\log_e\frac{r_1}{r_2}$

Answer

$\frac{\mu_0 nI}{2(r_2 - r_1)}\log_e\frac{r_2}{r_1}$

JEE Main 30 June 2022, Shift 1, Physics Q39

Same idea in other shifts