1
JEE Main 2022 (Online) 27th June Evening Shift
+4
-1

Two long parallel conductors S1 and S2 are separated by a distance 10 cm and carrying currents of 4A and 2A respectively. The conductors are placed along x-axis in X-Y plane. There is a point P located between the conductors (as shown in figure).

A charge particle of 3$$\pi$$ coulomb is passing through the point P with velocity $$\overrightarrow v = (2\widehat i + 3\widehat j)$$ m/s; where $$\widehat i$$ and $$\widehat j$$ represents unit vector along x & y axis respectively.

The force acting on the charge particle is $$4\pi \times {10^{ - 5}}( - x\widehat i + 2\widehat j)$$ N. The value of x is :

A
2
B
1
C
3
D
$$-$$3
2
JEE Main 2022 (Online) 26th June Morning Shift
+4
-1

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 :

A
1 : 4
B
4 : 1
C
2 : 1
D
1 : 2
3
JEE Main 2022 (Online) 25th June Evening Shift
+4
-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

A
B
B
2B
C
4B
D
$${B \over 2}$$
4
JEE Main 2022 (Online) 25th June Morning Shift
+4
-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 :

A
B $$\propto$$ r2
B
B $$\propto$$ r
C
B $$\propto$$ $${1 \over {{r^2}}}$$
D
B $$\propto$$ $${1 \over {{r}}}$$
EXAM MAP
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