A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced e.m.f. is
A
four times per revoluation
B
six times per revolution
C
once per revolution
D
twice per revolution
2
AIPMT 2012 Mains
MCQ (Single Correct Answer)
+4
-1
In a coil of resistance 10 $$\Omega $$, the induced current developed by changing magnetic flux through it, is shown in figure as a function of time. The magnitude of change in flux through the coil in weber is
A
8
B
2
C
6
D
4
3
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+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
4
AIPMT 2011 Prelims
MCQ (Single Correct Answer)
+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
