1
JEE Main 2023 (Online) 1st February Evening Shift
+4
-1

A coil is placed in magnetic field such that plane of coil is perpendicular to the direction of magnetic field. The magnetic flux through a coil can be changed :

A. By changing the magnitude of the magnetic field within the coil.

B. By changing the area of coil within the magnetic field.

C. By changing the angle between the direction of magnetic field and the plane of the coil.

D. By reversing the magnetic field direction abruptly without changing its magnitude.

Choose the most appropriate answer from the options given below :

A
A, B and D only
B
A, B and C only
C
A and B only
D
A and C only
2
JEE Main 2023 (Online) 1st February Evening Shift
+4
-1

As shown in the figure, a long straight conductor with semicircular arc of radius $$\frac{\pi}{10}$$m is carrying current $$\mathrm{I=3A}$$. The magnitude of the magnetic field, at the center O of the arc is :

(The permeability of the vacuum $$=4\pi\times10^{-7}~\mathrm{NA}^{-2}$$)

A
$$4\mu\mathrm{T}$$
B
$$3\mu\mathrm{T}$$
C
$$6\mu\mathrm{T}$$
D
$$1\mu\mathrm{T}$$
3
JEE Main 2023 (Online) 1st February Morning Shift
+4
-1

Find the magnetic field at the point $$\mathrm{P}$$ in figure. The curved portion is a semicircle connected to two long straight wires.

A
$$\frac{\mu_{0} i}{2 r}\left(\frac{1}{2}+\frac{1}{2 \pi}\right)$$
B
$$\frac{\mu_{\mathrm{o}} i}{2 r}\left(1+\frac{2}{\pi}\right)$$
C
$$\frac{\mu_{0} \dot{i}}{2 r}\left(\frac{1}{2}+\frac{1}{\pi}\right)$$
D
$$\frac{\mu_{0} i}{2 r}\left(1+\frac{1}{\pi}\right)$$
4
JEE Main 2023 (Online) 31st January Evening Shift
+4
-1
A long conducting wire having a current I flowing through it, is bent into a circular coil of $\mathrm{N}$ turns. Then it is bent into a circular coil of $\mathrm{n}$ turns. The magnetic field is calculated at the centre of coils in both the cases. The ratio of the magnetic field in first case to that of second case is :
A
$N^{2}: n^{2}$
B
$\mathrm{N}: \mathrm{n}$
C
$\mathrm{n}: \mathrm{N}$
D
$n^{2}: N^{2}$
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Physics
Mechanics
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