1
JEE Main 2022 (Online) 24th June Morning Shift
+4
-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.

A
Both (A) and (R) are true and (R) is the correct explanation of (A).
B
Both (A) and (R) are true but (R) is NOT the correct explanation of (A).
C
(A) is true but (R) is false.
D
(A) is false but (R) is true.
2
JEE Main 2022 (Online) 24th June Morning Shift
+4
-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 :

A
B/2
B
2B
C
$${\left( {{2 \over {\sqrt 5 }}} \right)^3}B$$
D
$${\left( {{2 \over {\sqrt 3}}} \right)^3}B$$
3
JEE Main 2021 (Online) 1st September Evening Shift
+4
-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?

A
1 m/s
B
1 cm/s
C
102 m/s
D
10$$-$$2 cm/s
4
JEE Main 2021 (Online) 1st September Evening Shift
+4
-1
Following plots show magnetization (M) vs magnetizing field (H) and magnetic susceptibility ($$\chi$$) vs temperature (T) graph :

Which of the following combination will be represented by a diamagnetic material?
A
(a), (c)
B
(a), (d)
C
(b), (d)
D
(b), (c)
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