JEE Main 2022 (Online) 24th June Morning Shift | Magnetics Question 70 | Physics

PREVIOUS NEXT

JEE Main 2022 (Online) 24th June Morning Shift

MCQ (Single Correct Answer)

-1

Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : In an uniform magnetic field, speed and energy remains the same for a moving charged particle.

Reason (R) : Moving charged particle experiences magnetic force perpendicular to its direction of motion.

Both (A) and (R) are true and (R) is the correct explanation of (A).

Both (A) and (R) are true but (R) is NOT the correct explanation of (A).

(A) is true but (R) is false.

(A) is false but (R) is true.

JEE Main 2022 (Online) 24th June Morning Shift

MCQ (Single Correct Answer)

-1

The magnetic field at the centre of a circular coil of radius r, due to current I flowing through it, is B. The magnetic field at a point along the axis at a distance $${r \over 2}$$ from the centre is :

B/2

$${\left( {{2 \over {\sqrt 5 }}} \right)^3}B$$

$${\left( {{2 \over {\sqrt 3}}} \right)^3}B$$

JEE Main 2021 (Online) 1st September Evening Shift

MCQ (Single Correct Answer)

-1

A square loop of side 20 cm and resistance 1$$\Omega$$ is moved towards right with a constant speed v₀. The right arm of the loop is in a uniform magnetic field of 5T. The field is perpendicular to the plane of the loop and is going into it. The loop is connected to a network of resistors each of value 4$$\Omega$$. What should be the value of v₀ so that a steady current of 2 mA flows in the loop?

JEE Main 2021 (Online) 1st September Evening Shift Physics - Magnetics Question 79 English

JEE Main 2021 (Online) 1st September Evening Shift Physics - Magnetics Question 79 English

1 m/s

1 cm/s

10² m/s

10^$$-$$2 cm/s

JEE Main 2021 (Online) 1st September Evening Shift

MCQ (Single Correct Answer)

-1

Following plots show magnetization (M) vs magnetizing field (H) and magnetic susceptibility ($$\chi $$) vs temperature (T) graph :

JEE Main 2021 (Online) 1st September Evening Shift Physics - Magnetics Question 77 English