JEE Main 2021 (Online) 16th March Morning Shift | Magnetics Question 116 | Physics

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

JEE Main 2021 (Online) 16th March Morning Shift

MCQ (Single Correct Answer)

-1

For an electromagnetic wave travelling in free space, the relation between average energy densities due to electric (U_e) and magnetic (U_m) fields is :

U_e = U_m

U_e $$\ne$$ U_m

U_e < U_m

U_e > U_m

JEE Main 2021 (Online) 16th March Morning Shift

MCQ (Single Correct Answer)

-1

A conducting bar of length L is free to slide on two parallel conducting rails as shown in the figure

JEE Main 2021 (Online) 16th March Morning Shift Physics - Magnetics Question 118 English

JEE Main 2021 (Online) 16th March Morning Shift Physics - Magnetics Question 118 English

Two resistors R₁ and R₂ are connected across the ends of the rails. There is a uniform magnetic field $$\overrightarrow B $$ pointing into the page. An external agent pulls the bar to the left at a constant speed v.

The correct statement about the directions of induced currents I₁ and I₂ flowing through R₁ and R₂ respectively is :

Both I₁ and I₂ are in clockwise direction

I₁ is in clockwise direction and I₂ is in anticlockwise direction

I₁ is in anticlockwise direction and I₂ is in clockwise direction

Both I₁ and I₂ are in anticlockwise direction

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