1
JEE Main 2019 (Online) 9th January Morning Slot
+4
-1
A current loop, having two circular arcs joined by two radial lines is shown in the figure. It carries a current of 10 A. The magnetic field at point O will be close to :

A
1.0 $$\times$$ 10$$-$$7 T
B
1.5 $$\times$$ 10$$-$$7 T
C
1.5 $$\times$$ 10$$-$$5 T
D
1.0 $$\times$$ 10$$-$$5 T
2
JEE Main 2019 (Online) 9th January Morning Slot
+4
-1
A conducting circular loop made of a thin wire, has area 3.5 $$\times$$ 10$$-$$3 m2 and resistance 10 $$\Omega$$. It is placed perpendicular to a time dependent magnetic field B(t) = (0.4T)sin(50$$\pi$$t). The field is uniform in space. Then the net charge flowing through the loop during t = 0 s and t = 10 ms is close to :
A
0.14 mC
B
0.7 mC
C
0.21 mC
D
0.6 mC
3
JEE Main 2019 (Online) 9th January Morning Slot
+4
-1
An infinitely long current carrying wire and a small current carrying loop are in the plane of the paper as shown. The radius of the loop is a and distance of its centre from the wire is d (d > > a). If the loop a applies a force F on the wire then :

A
$$F = 0$$
B
$$F \propto \left( {{a \over d}} \right)$$
C
$$F \propto \left( {{{{a^2}} \over {{d^3}}}} \right)$$
D
$$F \propto {\left( {{a \over d}} \right)^2}$$
4
JEE Main 2019 (Online) 9th January Morning Slot
+4
-1
A plane electromagnetic wave of frequency 50 MHz travels in free space along the positive x-direction. At a particular point in space and time, $$\overrightarrow E = 63\widehat j\,V/m.$$ The corresponding magnetic field $$\overrightarrow {B,}$$ at that point will be :
A
18.9 $$\times$$ 10$$-$$8 $$\widehat k$$T
B
2.1 $$\times$$ 10$$-$$8 $$\widehat k$$T
C
6.3 $$\times$$ 10$$-$$8 $$\widehat k$$T
D
18.9 $$\times$$ 108 $$\widehat k$$T
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Mechanics
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