1
WB JEE 2020
+2
-0.5 A conducting circular loop of resistance 20$$\Omega$$ and cross-sectional area 20 $$\times$$ 10-2 m2 is placed perpendicular to a spatially uniform magnetic field B, which varies with time t as B = 2sin(50$$\pi$$t) T. Find the net charge flowing through the loop in 20 ms starting from t = 0.
A
0.5 C
B
0.2 C
C
0 C
D
0.14 C
2
WB JEE 2018
+2
-0.5 As shown in the figure, a rectangular loop of conducting wire is moving away with a constant velocity v in a perpendicular direction from a very long straight conductor carrying a steady current I. When the breadth of the rectangular loop is very small compared to its distance from the straight conductor, how does the emf. E induced in the loop vary with time t? A
$$E \propto {1 \over {{t^2}}}$$
B
$$E \propto {1 \over t}$$
C
$$E \propto \ln (t)$$
D
$$E \propto {1 \over {{t^3}}}$$
WB JEE Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
Mathematics
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Trigonometry
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Calculus
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