1
JEE Main 2019 (Online) 10th January Morning Slot
+4
-1
A magnet of total magnetic moment 10-2$${\widehat i}$$A-m2 is placed in a time varying magnetic field, B$${\widehat i}$$ (co where B = 1 Tesla and $$\omega$$ = 0.125 rad/s. The work done for reversing the direction of the magnetic moment at t = 1 second, is -
A
0.014 J
B
0.028 J
C
0.01 J
D
0.007 J
2
JEE Main 2019 (Online) 10th January Morning Slot
+4
-1
A solid metal cube of edge length 2 cm is moving in a positive y-direction at a constant speed of 6 m/s. There is a uniform magnetic field of 0.1 T in the positive z-direction. The potential difference between the two faces of the cube perpendicular to the x-axis, is -
A
2mV
B
12 mV
C
6 mV
D
1 mV
3
JEE Main 2019 (Online) 10th January Morning Slot
+4
-1
An insulating thin rod of length $$l$$ has a linear charge density $$\rho \left( x \right)$$ = $${\rho _0}{x \over l}$$ on it. The rod is rotated about an axis passing through the origin (x = 0) and perpendicular to the rod. If the rod makes n rotations per second, then the time averaged magnetic moment of the rod is -
A
$${\pi \over 3}n\rho {l^3}$$
B
$${\pi \over 4}n\rho {l^3}$$
C
$$n\rho {l^3}$$
D
$$\pi n\rho {l^3}$$
4
JEE Main 2019 (Online) 9th January Evening Slot
+4
-1
The energy associated with electric field is (UE) and with magnetic field is (UB) for an electromagnetic wave in free space. Then :
A
$${U_E} = {{{U_B}} \over 2}$$
B
$${U_E} > {U_B}$$
C
$${U_E} < {U_B}$$
D
$${U_E} = {U_B}$$
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