MHT CET 2021 20th September Morning Shift | Moving Charges and Magnetism Question 45 | 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)

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

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

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

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

MHT CET 2020 16th October Morning Shift

MCQ (Single Correct Answer)

-0

An electron $$(e)$$ is revolving in a circular orbit of radius $$r$$ in hydrogen atom. The angular momentum of the electron is ($$M=$$ magnetic dipole moment associated with it and $$m=$$ mass of electron)

$$\frac{m M}{e}$$

$$\frac{3 M m}{e}$$

$$\frac{2 m M}{e}$$

$$\frac{4 m M}{e}$$

MHT CET 2020 16th October Morning Shift

MCQ (Single Correct Answer)

-0

A charged particle is moving in a uniform magnetic field in a circular path of radius $$R$$. When the energy of the particle becomes three times the original, the new radius will be

$$R$$

$$\sqrt{3} R$$

$$3 R$$

$$\frac{R}{3}$$

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