MHT CET 2021 22th September Evening Shift | Moving Charges and Magnetism Question 80 | Physics

The magnetic field inside a current carrying toroidal solenoid is $$0.2 \mathrm{~mT}$$. What is the magnetic field inside the toroid if the current through it is tripled and radius is made $$\frac{1}{3}^{\text {rd}}$$ ?

0.2 mT

0.6 mT

0.8 mT

0.9 mT

MHT CET 2021 22th September Morning Shift

MCQ (Single Correct Answer)

-0

When a battery is connected to the two ends of a diagonal of a square conductor frame of side '$$a$$', the magnitude of magnetic field at the centre will be ( $$\mu_0=$$ permeability of free space)

$$\frac{\mu_0}{\sqrt{2} \pi \mathrm{a}}$$

$$\frac{\sqrt{2} \mu_0}{\pi \mathrm{a}}$$

$$\frac{\mu_0}{\pi \mathrm{a}}$$

zero

MHT CET 2021 22th September Morning Shift

MCQ (Single Correct Answer)

-0

Two concentric coplanar circular loops of radii '$$r{ }_1$$' and '$$r_2$$' respectively carry currents '$$i_1$$' and '$$\mathrm{i}_2$$' in opposite directions (one clockwise and other anticlockwise). The magnetic induction at the centre of the loops is half that due to '$$i_1$$' alone at the centre. If $$r_2=2 r_1$$, the value of $$\frac{i_2}{i_1}$$

$$\frac{1}{4}$$

$$\frac{1}{2}$$

MHT CET 2021 22th September Morning Shift

MCQ (Single Correct Answer)

-0

Assuming the atom is in the ground state, the expression for the magnetic field at a point nucleus in hydrogen atom due to circular motion of electron is [$$\mu_0=$$ permeability of free space, $$\mathrm{m}=$$ mass of electron, $$\epsilon_0=$$ permittivity of free space, $$\mathrm{h}=$$ Planck's constant ]

$$\frac{\mu_0 \mathrm{e}^7 \pi \mathrm{m}^2}{8 \in_0^3 \mathrm{~h}^5}$$

$$\frac{\mu_0 \mathrm{e}^5 \pi \mathrm{m}^3}{8 \epsilon_0^3 \mathrm{~h}^5}$$

$$\frac{\mu_0 \mathrm{e}^5 \pi^2 \mathrm{~m}^2}{8 \epsilon_0^2 \mathrm{~h}^4}$$

$$\frac{\mu_0 \mathrm{e}^7 \pi^2 \mathrm{~m}^2}{8 \epsilon_0^3 \mathrm{~h}^5}$$

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