MHT CET 2019 3rd May Morning Shift | Moving Charges and Magnetism Question 104 | Physics

Six very long insulated copper wires are bound together to form a cable. The currents carried by the wires are $I_1=+10 \mathrm{~A}, I_2=-13 \mathrm{~A}, I_3=+10$ $\mathrm{A}, I_4=+7 \mathrm{~A}, I_5=-12 \mathrm{~A}$ and $I_6=+18 \mathrm{~A}$. The magnetic induction at a perpendicular distance of 10 cm from the cable is $\left(\mu_0=4 \pi \times 10^{-7} \mathrm{~Wb} / \mathrm{A}-\mathrm{m}\right)$

$40 \mu \mathrm{~T}$

$37.5 \mu \mathrm{~T}$

$30 \mu \mathrm{~T}$

$35 \mu \mathrm{~T}$

MHT CET 2019 3rd May Morning Shift

MCQ (Single Correct Answer)

-0

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

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

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

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

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

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