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

The soft-iron is a suitable material for making an electromagnet. This is because soft-iron has

A
low coercivity and high retentivity.
B
low coercivity and low permeability.
C
high permeability and low retentivity.
D
high permeability and high retentivity.
2
JEE Main 2022 (Online) 24th June Evening Shift
+4
-1

A proton, a deutron and an $$\alpha$$-particle with same kinetic energy enter into a uniform magnetic field at right angle to magnetic field. The ratio of the radii of their respective circular paths is :

A
1 : $$\sqrt 2$$ : $$\sqrt 2$$
B
1 : 1 : $$\sqrt 2$$
C
$$\sqrt 2$$ : 1 : 1
D
1 : $$\sqrt 2$$ : 1
3
JEE Main 2022 (Online) 24th June Evening Shift
+4
-1

An electric bulb is rated as 200 W. What will be the peak magnetic field at 4 m distance produced by the radiations coming from this bulb? Consider this bulb as a point source with 3.5% efficiency.

A
1.19 $$\times$$ 10$$-$$8T
B
1.71 $$\times$$ 10$$-$$8T
C
0.84 $$\times$$ 10$$-$$8T
D
3.36 $$\times$$ 10$$-$$8T
4
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.
JEE Main Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
Mathematics
Algebra
Trigonometry
Coordinate Geometry
Calculus
EXAM MAP
Joint Entrance Examination