JEE Main 2022 (Online) 26th June Morning Shift | Magnetic Effect of Current Question 85 | Physics

A proton and an alpha particle of the same velocity enter in a uniform magnetic field which is acting perpendicular to their direction of motion. The ratio of the radii of the circular paths described by the alpha particle and proton is :

1 : 4

4 : 1

2 : 1

1 : 2

JEE Main 2022 (Online) 25th June Evening Shift

MCQ (Single Correct Answer)

-1

A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved, the new value of magnetic field will be equal to

$${B \over 2}$$

JEE Main 2022 (Online) 25th June Morning Shift

MCQ (Single Correct Answer)

-1

A long straight wire with a circular cross-section having radius R, is carrying a steady current I. The current I is uniformly distributed across this cross-section. Then the variation of magnetic field due to current I with distance r (r < R) from its centre will be :

B $$\propto$$ r²

B $$\propto$$ r

B $$\propto$$ $${1 \over {{r^2}}}$$

B $$\propto$$ $${1 \over {{r}}}$$

JEE Main 2022 (Online) 24th June Evening Shift

MCQ (Single Correct Answer)

-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 :

1 : $$\sqrt 2 $$ : $$\sqrt 2 $$

1 : 1 : $$\sqrt 2 $$

$$\sqrt 2 $$ : 1 : 1

1 : $$\sqrt 2 $$ : 1

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