1
JEE Main 2022 (Online) 28th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

As shown in the figure, a metallic rod of linear density $$0.45 \mathrm{~kg} \mathrm{~m}^{-1}$$ is lying horizontally on a smooth inclined plane which makes an angle of $$45^{\circ}$$ with the horizontal. The minimum current flowing in the rod required to keep it stationary, when $$0.15 \mathrm{~T}$$ magnetic field is acting on it in the vertical upward direction, will be :

{Use $$g=10 \mathrm{~m} / \mathrm{s}^{2}$$}

JEE Main 2022 (Online) 28th July Morning Shift Physics - Magnetic Effect of Current Question 50 English

A
30 A
B
15 A
C
10 A
D
3 A
2
JEE Main 2022 (Online) 28th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The equation of current in a purely inductive circuit is $$5 \sin \left(49\, \pi t-30^{\circ}\right)$$. If the inductance is $$30 \,\mathrm{mH}$$ then the equation for the voltage across the inductor, will be :

$$\left\{\right.$$ Let $$\left.\pi=\frac{22}{7}\right\}$$

A
$$1.47 \sin \left(49 \pi t-30^{\circ}\right)$$
B
$$1.47 \sin \left(49 \pi t+60^{\circ}\right)$$
C
$$23.1 \sin \left(49 \pi t-30^{\circ}\right)$$
D
$$23.1 \sin \left(49 \pi t+60^{\circ}\right)$$
3
JEE Main 2022 (Online) 28th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

As shown in the figure, after passing through the medium 1 . The speed of light $$v_{2}$$ in medium 2 will be :

$$\left(\right.$$ Given $$\mathrm{c}=3 \times 10^{8} \mathrm{~ms}^{-1}$$ )

JEE Main 2022 (Online) 28th July Morning Shift Physics - Geometrical Optics Question 50 English

A
$$1.0 \times 10^{8} \mathrm{~ms}^{-1}$$
B
$$0.5 \times 10^{8} \mathrm{~ms}^{-1}$$
C
$$1.5 \times 10^{8} \mathrm{~ms}^{-1}$$
D
$$3.0 \times 10^{8} \mathrm{~ms}^{-1}$$
4
JEE Main 2022 (Online) 28th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

In normal adujstment, for a refracting telescope, the distance between objective and eye piece is $$30 \mathrm{~cm}$$. The focal length of the objective, when the angular magnification of the telescope is 2 , will be :

A
20 cm
B
30 cm
C
10 cm
D
15 cm
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