1
JEE Main 2019 (Online) 9th April Evening Slot
+4
-1
A moving coil galvanometer has a coil with 175 turns and area 1 cm2. It uses a torsion band of torsion constant 10–6 N-m/rad. The coil is placed in a maganetic field B parallel to its plane. The coil deflects by 1° for a current of 1 mA. The value of B (in Tesla) is approximately :-
A
10–4
B
10–2
C
10–1
D
10–3
2
JEE Main 2019 (Online) 9th April Morning Slot
+4
-1
A rigid square loop of side 'a' and carrying current I2 is lying on a horizontal surface near a long current I1 carrying wire in the same plane as shown in figure. The net force on the loop due to wire will be : A
Repulsive and equal to $$\mu$$0I1I2/4$$\pi$$
B
Attractive and equal to $$\mu$$0I1I2/3$$\pi$$
C
Repulsive and equal to $$\mu$$0I1I2/2$$\pi$$
D
Zero
3
JEE Main 2019 (Online) 9th April Morning Slot
+4
-1
The magnetic field of a plane electromagnetic wave is given by :
$$\overline B = {B_0}\widehat i\left[ {\cos (kz - \omega t)} \right] + {B_i}\widehat j\cos (kz + \omega t)$$\$ B0 = 3 × 10–5 T and B1 = 2 × 10–6 T.
The rms value of the force experienced by a stationary charge Q = 10–4 C at z = 0 is closest to :
A
0.6 N
B
0.9 N
C
3 × 10–2 N
D
0.1 N
4
JEE Main 2019 (Online) 9th April Morning Slot
+4
-1
A rectangular coil (Dimension 5 cm × 2.5 cm) with 100 turns, carrying a current of 3 A in the clock-wise direction is kept centered at the origin and in the X-Z plane. A magnetic field of 1 T is applied along X-axis. If the coil is tilted through 45° about Z-axis, then the torque on the coil is :
A
0.42 Nm
B
0.55 Nm
C
0.38 Nm
D
0.27 Nm
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