JEE Main 2021 (Online) 27th August Morning Shift | Magnetics Question 85 | Physics

JEE Main 2021 (Online) 27th August Morning Shift

MCQ (Single Correct Answer)

-1

Two ions of masses 4 amu and 16 amu have charges +2e and +3e respectively. These ions pass through the region of constant perpendicular magnetic field. The kinetic energy of both ions is same. Then :

lighter ion will be deflected less than heavier ion

lighter ion will be deflected more than heavier ion

both ions will be deflected equally

no ion will be deflected

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