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JEE Main 2022 (Online) 29th June Morning Shift
+4
-1 English
Hindi

A charge particle moves along circular path in a uniform magnetic field in a cyclotron. The kinetic energy of the charge particle increases to 4 times its initial value. What will be the ratio of new radius to the original radius of circular path of the charge particle :

A
1 : 1
B
1 : 2
C
2 : 1
D
1 : 4
2
JEE Main 2022 (Online) 29th June Morning Shift
+4
-1 English
Hindi

At a certain place the angle of dip is 30$$^\circ$$ and the horizontal component of earth's magnetic field is 0.5 G. The earth's total magnetic field (in G), at that certain place, is :

A
$${1 \over {\sqrt 3 }}$$
B
$${1 \over 2}$$
C
$$\sqrt 3$$
D
1
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JEE Main 2022 (Online) 28th June Evening Shift
+4
-1 English
Hindi

The space inside a straight current carrying solenoid is filled with a magnetic material having magnetic susceptibility equal to 1.2 $$\times$$ 10$$-$$5. What is fractional increase in the magnetic field inside solenoid with respect to air as medium inside the solenoid?

A
1.2 $$\times$$ 10$$-$$5
B
1.2 $$\times$$ 10$$-$$3
C
1.8 $$\times$$ 10$$-$$3
D
2.4 $$\times$$ 10$$-$$5
4
JEE Main 2022 (Online) 28th June Evening Shift
+4
-1 English
Hindi

Two parallel, long wires are kept 0.20 m apart in vacuum, each carrying current of x A in the same direction. If the force of attraction per meter of each wire is 2 $$\times$$ 10$$-$$6 N, then the value of x is approximately :

A
1
B
2.4
C
1.4
D
2
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