MHT CET 2021 20th September Evening Shift | Moving Charges and Magnetism Question 129 | Physics

The magnetic field intensity 'H' at the centre of a long solenoid having 'n' turns per unit length and carrying a current 'I', when no material is kept in it, is

$$\mathrm{\frac{1}{n}}$$

$$\mathrm{\frac{n}{1}}$$

$$\mathrm{nI}$$

$$\mathrm{n^2I}$$

MHT CET 2021 20th September Morning Shift

MCQ (Single Correct Answer)

-0

An electron (e) moves in circular orbit of radius 'r' with uniform speed 'V'. It produces magnetic field 'B' at the centre of circle. The magnetic field B is $$\left(\mu_0=\right.$$ permeability of free space)

$$\frac{\mu_0 \mathrm{e}}{4 \pi}\left(\frac{\mathrm{V}}{\mathrm{r}^2}\right)$$

$$\frac{\mu_0 \mathrm{e}}{4 \pi} \mathrm{Vr}^2$$

$$\frac{\mu_0 \mathrm{e}}{4 \pi}\left(\frac{\mathrm{V}}{\mathrm{r}}\right)$$

$$\frac{\mu_0 \mathrm{e}}{4 \pi} \mathrm{Vr}$$

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