JEE Main 2020 (Online) 3rd September Evening Slot | Magnetics Question 147 | Physics

JEE Main 2020 (Online) 3rd September Evening Slot

MCQ (Single Correct Answer)

-1

A perfectly diamagnetic sphere has a small spherical cavity at its centre, which is filled with a paramagnetic substance. The whole system is placed in a uniform magnetic field $$\overrightarrow B $$ . Then the field inside the paramagnetic substance is : JEE Main 2020 (Online) 3rd September Evening Slot Physics - Magnetics Question 145 English

JEE Main 2020 (Online) 3rd September Evening Slot Physics - Magnetics Question 145 English

$$\overrightarrow B $$

zero

much large than $$\left| {\overrightarrow B } \right|$$ and parallel to $$\overrightarrow B $$

much large than $$\left| {\overrightarrow B } \right|$$ but opposite to $$\overrightarrow B $$

JEE Main 2020 (Online) 3rd September Morning Slot

MCQ (Single Correct Answer)

-1

A charged particle carrying charge 1 $$\mu $$C is moving
with velocity $$\left( {2\widehat i + 3\widehat j + 4\widehat k} \right)$$ ms^–1. If an external
magnetic field of $$\left( {5\widehat i + 3\widehat j - 6\widehat k} \right)$$× 10^–3 T exists in the region where the particle is moving then the
force on the particle is $$\overrightarrow F $$ × 10^–9 N. The vector $$\overrightarrow F $$ is :

$${ - 0.30\widehat i + 0.32\widehat j - 0.09\widehat k}$$

$${ - 300\widehat i + 320\widehat j - 90\widehat k}$$

$${ - 30\widehat i + 32\widehat j - 9\widehat k}$$

$${ - 3.0\widehat i + 3.2\widehat j - 0.9\widehat k}$$

JEE Main 2020 (Online) 3rd September Morning Slot

MCQ (Single Correct Answer)

-1

An elliptical loop having resistance R, of semi major axis a, and semi minor axis b is placed in magnetic field as shown in the figure. If the loop is rotated about the x-axis with angular frequency $$\omega $$, the average power loss in the loop due to Joule heating is : JEE Main 2020 (Online) 3rd September Morning Slot Physics - Magnetics Question 147 English

JEE Main 2020 (Online) 3rd September Morning Slot Physics - Magnetics Question 147 English

$${{\pi abB\omega } \over R}$$

$${{{\pi ^2}{a^2}{b^2}{B^2}{\omega ^2}} \over R}$$

$${{{\pi ^2}{a^2}{b^2}{B^2}{\omega ^2}} \over {2R}}$$

Zero

JEE Main 2020 (Online) 3rd September Morning Slot

MCQ (Single Correct Answer)

-1

Magnitude of magnetic field (in SI units) at the centre of a hexagonal shape coil of side 10 cm, 50 turns and carrying current I (Ampere) in units of $${{{\mu _0}I} \over \pi }$$ is :

250$$\sqrt 3 $$

5$$\sqrt 3 $$

500$$\sqrt 3 $$

50$$\sqrt 3 $$

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