MHT CET 2019 3rd May Morning Shift | Moving Charges and Magnetism Question 105 | Physics

A circular coil and a square coil is prepared from two identical metal wires and a current is passed through it. Ratio of magnetic dipole moment associated with circular coil to that of square coil is

$\frac{2}{\pi}$

$\frac{\pi}{2}$

$\pi$

$\frac{4}{\pi}$

MHT CET 2019 3rd May Morning Shift

MCQ (Single Correct Answer)

-0

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 37 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]

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

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

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

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

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