MHT CET 2025 25th April Morning Shift | Moving Charges and Magnetism Question 1 | 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 ( $\mu_0=$ permeability of free space)

$\mu_0 \mathrm{nI}$

$\frac{\mathrm{n}}{\mathrm{I}}$

$\frac{\mu_0}{\mathrm{nI}}$

MHT CET 2025 25th April Morning Shift

MCQ (Single Correct Answer)

-0

Current $I$ is carried in a wire of length ' $L$ '. If wire is bent into a circular coil of single turn, the maximum torque in a given magnetic field $B$ is

$\frac{\mathrm{L}^2 \mathrm{~B}}{4 \pi}$

$\frac{\mathrm{L}^2 \mathrm{IB}}{4 \pi}$

$\frac{\mathrm{L}^2 \mathrm{~B}^2}{2}$

$\frac{\mathrm{L}^2 \mathrm{IB}}{2}$

MHT CET 2025 25th April Morning Shift

MCQ (Single Correct Answer)

-0

A square of side ' $L$ ' metre lies in $x-y$ plane in a region where the magnetic field is $\overline{\mathrm{B}}$ and $\vec{B}=B_0(2 \hat{i}+3 \hat{j}+4 \hat{k})$, where $B_0$ is constant. The magnitude of flux passing through the square (in weber) is

$\sqrt{29} \mathrm{~B}_0 \mathrm{~L}^2$

$4 \mathrm{~B}_0 \mathrm{~L}^2$

$2 \mathrm{~B}_0 \mathrm{~L}^2$

$3 \mathrm{~B}_0 \mathrm{~L}^2$

MHT CET 2025 25th April Morning Shift

MCQ (Single Correct Answer)

-0

A long straight wire of radius ' $r$ ' carries a steady current ' $I$ '. The current is uniformly distributed over its cross-section. The ratio $\left(\frac{B}{B_1}\right)$ of the magnetic field ' B ' and ' $\mathrm{B}_1$ ' at radial distances ' $\frac{r}{2}$ ' and ' $3 r$ respectively, from the axis of the wire is

$\frac{1}{2}$

$\frac{3}{2}$

$\frac{5}{2}$

$\frac{1}{2}$

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