JEE Main 2021 (Online) 16th March Evening Shift | Magnetics Question 114 | Physics

JEE Main 2021 (Online) 16th March Evening Shift

MCQ (Single Correct Answer)

-1

A charge Q is moving $$\overrightarrow {dl} $$ distance in the magnetic field $$\overrightarrow {B} $$. Find the value of work done by $$\overrightarrow {B} $$.

Zero

$$-$$1

Infinite

JEE Main 2021 (Online) 16th March Evening Shift

MCQ (Single Correct Answer)

-1

The magnetic field in a region is given by $$\overrightarrow B = {B_o}\left( {{x \over a}} \right)\widehat k$$. A square loop of side d is placed with its edges along the x and y axes. The loop is moved with a constant velocity $$\overrightarrow v $$ = v₀$$\widehat i$$. The emf induced in the loop is :

JEE Main 2021 (Online) 16th March Evening Shift Physics - Magnetics Question 114 English

JEE Main 2021 (Online) 16th March Evening Shift Physics - Magnetics Question 114 English

$${{{B_o}{v_o}{d^2}} \over {2a}}$$

$${{{B_o}v_o^2d} \over {2a}}$$

$${{{B_o}{v_o}d} \over {2a}}$$

$${{{B_o}{v_o}{d^2}} \over a}$$

JEE Main 2021 (Online) 16th March Morning Shift

MCQ (Single Correct Answer)

-1

A plane electromagnetic wave of frequency 500 MHz is travelling in vacuum along y-direction. At a particular point in space and time,
$$\overrightarrow B $$ = 8.0 $$\times$$ 10^$$-$$8 $$\widehat z$$T. The value of electric field at this point is :

(speed of light = 3 $$\times$$ 10⁸ ms^$$-$$1)

$$\widehat x$$, $$\widehat y$$, $$\widehat z$$ are unit vectors along x, y and z directions.

2.6 $$\widehat x$$ V/m

$$-$$24 $$\widehat x$$ V/m

24 $$\widehat x$$ V/m

$$-$$2.6 $$\widehat y$$ V/m

JEE Main 2021 (Online) 16th March Morning Shift

MCQ (Single Correct Answer)

-1

A bar manet of length 14 cm is placed in the magnetic meridian with its north pole pointing towards the geographic north pole. A neutral point is obtained at a distance of 18 cm from the center of the magnet. If B_H = 0.4 G, the magnetic moment of the magnet is (1G = 10^$$-$$4 T)

2.880 $$\times$$ 10² J T^$$-$$1

2.880 J T^$$-$$1

2.880 $$\times$$ 10³ J T^$$-$$1

28.80 J T^$$-$$1

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