1
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
In a uniform magnetic field of induction $$B$$ a wire in the form of a semicircle of radius $$r$$ rotates about the diameter of the circle with an angular frequency $$\omega .$$ The axis of rotation is perpendicular to the field. If the total resistance of the circuit is $$R,$$ the mean power generated per period of rotation is
A
$${{{{\left( {B\pi r\omega } \right)}^2}} \over {2R}}$$
B
$${{{{\left( {B\pi {r^2}\omega } \right)}^2}} \over {8R}}$$
C
$${{B\pi {r^2}\omega } \over {2R}}$$
D
$${{{{\left( {B\pi r{\omega ^2}} \right)}^2}} \over {8R}}$$
2
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
A metal conductor of length $$1$$ $$m$$ rotates vertically about one of its ends at angular velocity $$5$$ radians per second. If the horizontal component of earth's magnetic field is $$0.2 \times {10^{ - 4}}T,$$ then the $$e.m.f.$$ developed between the two ends of the conductor is
A
$$5mV$$
B
$$50\mu V$$
C
$$5\mu V$$
D
$$50mV$$
3
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
Two coils are placed close to each other. The mutual inductance of the pair of coils depends upon
A
the rates at which currents are changing in the two coils
B
relative position and orientation of the two coils
C
the currents in the two coils
D
the materials of the wires of the coils
4
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
When the current changes from $$ + 2A$$ to $$-2A$$ in $$0.05$$ second, an $$e.m.f.$$ of $$8$$ $$V$$ is inducted in a coil. The coefficient of self- induction of the coil is
A
$$0.2H$$
B
$$0.4H$$
C
$$0.8$$ $$H$$
D
$$0.1$$ $$H$$
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