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1
MHT CET 2021 20th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

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

A
$$\mathrm{\frac{1}{n}}$$
B
$$\mathrm{\frac{n}{1}}$$
C
$$\mathrm{nI}$$
D
$$\mathrm{n^2I}$$
2
MHT CET 2021 20th September Morning Shift
MCQ (Single Correct Answer)
+1
-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)

A
$$\frac{\mu_0 \mathrm{e}}{4 \pi}\left(\frac{\mathrm{V}}{\mathrm{r}^2}\right)$$
B
$$\frac{\mu_0 \mathrm{e}}{4 \pi} \mathrm{Vr}^2$$
C
$$\frac{\mu_0 \mathrm{e}}{4 \pi}\left(\frac{\mathrm{V}}{\mathrm{r}}\right)$$
D
$$\frac{\mu_0 \mathrm{e}}{4 \pi} \mathrm{Vr}$$
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