JEE Main 2021 (Online) 26th August Evening Shift | Magnetics Question 87 | Physics

JEE Main 2021 (Online) 26th August Evening Shift

MCQ (Single Correct Answer)

-1

A light beam is described by $$E = 800\sin \omega \left( {t - {x \over c}} \right)$$. An electron is allowed to move normal to the propagation of light beam with a speed of 3 $$\times$$ 10⁷ ms^$$-$$1. What is the maximum magnetic force exerted on the electron?

1.28 $$\times$$ 10^$$-$$18 N

1.28 $$\times$$ 10^$$-$$21 N

12.8 $$\times$$ 10^$$-$$17 N

12.8 $$\times$$ 10^$$-$$18 N

JEE Main 2021 (Online) 26th August Morning Shift

MCQ (Single Correct Answer)

-1

The fractional change in the magnetic field intensity at a distance 'r' from centre on the axis of current carrying coil of radius 'a' to the magnetic field intensity at the centre of the same coil is : (Take r < a)

$${3 \over 2}{{{a^2}} \over {{r^2}}}$$

$${2 \over 3}{{{a^2}} \over {{r^2}}}$$

$${2 \over 3}{{{r^2}} \over {{a^2}}}$$

$${3 \over 2}{{{r^2}} \over {{a^2}}}$$

JEE Main 2021 (Online) 27th July Evening Shift

MCQ (Single Correct Answer)

-1

Figure A and B shown to long straight wires of circular cross-section (a and b with a < b), carrying current I which is uniformly distributed across the cross-section. The magnitude of magnetic field B varies with radius r and can be represented as :

JEE Main 2021 (Online) 27th July Evening Shift Physics - Magnetics Question 93 English

JEE Main 2021 (Online) 27th July Evening Shift Physics - Magnetics Question 93 English

JEE Main 2021 (Online) 27th July Evening Shift Physics - Magnetics Question 93 English Option 1

JEE Main 2021 (Online) 27th July Evening Shift Physics - Magnetics Question 93 English Option 2

JEE Main 2021 (Online) 27th July Evening Shift Physics - Magnetics Question 93 English Option 3

JEE Main 2021 (Online) 27th July Evening Shift Physics - Magnetics Question 93 English Option 4

JEE Main 2021 (Online) 25th July Evening Shift

MCQ (Single Correct Answer)

-1

Two ions having same mass have charges in the ratio 1 : 2. They are projected normally in a uniform magnetic field with their speeds in the ratio 2 : 3. The ratio of the radii of their circular trajectories is :

1 : 4

4 : 3

3 : 1

2 : 3

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