1
AIPMT 2012 Prelims
+4
-1
A coil of resistance 400 $$\Omega$$ is placed in a magnetic field. If the magnetic flux $$\phi$$ (Wb) linked with the coil varies with time t (sec) as $$\phi = 50{t^2} + 4$$.

The current in the coil at t = 2 sec is
A
0.5 A
B
0.1 A
C
2 A
D
1 A
2
AIPMT 2011 Prelims
+4
-1
The current $$i$$ in a coil varies with time as shown in the figure. The variation of induced emf with time would be

A
B
C
D
3
AIPMT 2010 Prelims
+4
-1
A conducting circular loop is placed in a uniform magnetic field, B = 0.025 T with its plane perpendicular to the loop. The radius of the loop is made to shrink at a constant rate of 1 mm s$$-$$1. The induced emf when the radius is 2 cm, is
A
$$2\pi \mu V$$
B
$$\pi \mu V$$
C
$${\pi \over 2}\mu V$$
D
2$$\mu$$$$V$$
4
AIPMT 2009
+4
-1
A rectangular, a square, a circular and an elliptical loop, all in the (x-y) plane, are moving out of a uniform magnetic field with a constant velocity. $$\overrightarrow V = v\widehat i$$. The magnetic field is directed along the negative z axis direction. The induced emf, during the passes of these loops, out of the field region, will not remain constant for
A
The circular and the elliptical loops
B
only the ellliptical loop
C
any of the four loops
D
the rectangular, circular and elliptical loops
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