1
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
2
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
3
JEE Main 2019 (Online) 8th April Evening Slot
+4
-1
Two very long, straight, and insulated wires are kept at 90° angle from each other in xy-plane as shown in the figure. These wires carry currents of equal magnitude I, whose directions are shown in the figure. The net magnetic field at point P will be :
A
$${{ + {\mu _0}I} \over {\pi d}}\left( {\mathop z\limits^ \wedge } \right)$$
B
$$- {{{\mu _0}I} \over {2\pi d}}\left( {\mathop x\limits^ \wedge + \mathop y\limits^ \wedge } \right)$$
C
Zero
D
$${{{\mu _0}I} \over {2\pi d}}\left( {\mathop x\limits^ \wedge + \mathop y\limits^ \wedge } \right)$$
4
JEE Main 2019 (Online) 8th April Morning Slot
+4
-1
A circular coil having N turns and radius r carries a current I. It is held in the XZ plane in a magnetic field B$${\mathop i\limits^ \wedge }$$ . The torque on the coil due to the magnetic field is :
A
$${{B{r^2}I} \over {\pi N}}$$
B
B$$\pi$$r2IN
C
Zero
D
$${{B\pi{r^2}I} \over { N}}$$
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