MHT CET 2019 3rd May Morning Shift | Moving Charges and Magnetism Question 106 | Physics

Figure show the circular coil carrying current $I$ kept very close but not touching at a point $A$ on a straight conductor carrying the same current $I$. The magnitude of magnetic induction at the centre of the circular coil will be

MHT CET 2019 3rd May Morning Shift Physics - Moving Charges and Magnetism Question 39 English

$\frac{\mu_0 0}{2 r}\left(1+\frac{1}{\pi}\right)$

$\frac{\mu_0 l}{2 \pi r}$

$\frac{\mu_0 l}{2 r}$

zero

MHT CET 2019 2nd May Evening Shift

MCQ (Single Correct Answer)

-0

Torque acting on a rectangular coil carrying current ' $l$ ' situated parallel to magnetic field of induction ' $B$ ', having number of turns ' $n$ ' and area ' $A$ ' is

$n i(\hat{A} \cdot \hat{B})$

$\frac{n B A}{i}$

$n i(\mathbf{A} \times \mathbf{B})$

$\frac{i B A}{n}$

MHT CET 2019 2nd May Evening Shift

MCQ (Single Correct Answer)

-0

A circular coil of wire consisting of 100 turns each of radius 9 cm carries a current of 0.4 A . The magnitude of the magnetic field at the centre of coil is $\left[\mu_0=12.56 \times 10^{-7} \mathrm{SI}\right.$ Unit]

$2.4 \times 10^{-11} \mathrm{~T}$

$2.79 \times 10^{-5} \mathrm{~T}$

$2.79 \times 10^{-4} \mathrm{~T}$

$2.79 \times 10^{-3} \mathrm{~T}$

MHT CET 2019 2nd May Evening Shift

MCQ (Single Correct Answer)

-0

The magnetic dipole moment of a short magnetic dipole at a distant point along the equator of magnet has a magnitude of ' $X$ ' in SI units. If the distance between the point and the magnet is halved then the magnitude of dipole moment will be

$2 x$

$\frac{1}{2} x$

$X$

$\frac{1}{8} x$

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