AIEEE 2004 | Electromagnetic Induction Question 127 | Physics

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

$$5mV$$

$$50\mu V$$

$$5\mu V$$

$$50mV$$

AIEEE 2004

MCQ (Single Correct Answer)

-1

A coil having $$n$$ turns and resistance $$R\Omega $$ is connected with a galvanometer of resistance $$4R\Omega .$$ This combination is moved in time $$t$$ seconds from a magnetic field $${W_1}$$ weber to $${W_2}$$ weber. The induced current in the circuit is

$${{\left( {{W_2} - {W_1}} \right)} \over {Rnt}}$$

$$ - {{n\left( {{W_2} - {W_1}} \right)} \over {5\,\,Rt}}$$

$$ - {{\left( {{W_2} - {W_1}} \right)} \over {5\,\,Rnt}}$$

$$ - {{n\left( {{W_2} - {W_1}} \right)} \over {Rt}}$$

AIEEE 2004

MCQ (Single Correct Answer)

-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

$${{{{\left( {B\pi r\omega } \right)}^2}} \over {2R}}$$

$${{{{\left( {B\pi {r^2}\omega } \right)}^2}} \over {8R}}$$

$${{B\pi {r^2}\omega } \over {2R}}$$

$${{{{\left( {B\pi r{\omega ^2}} \right)}^2}} \over {8R}}$$

AIEEE 2003

MCQ (Single Correct Answer)

-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

$$0.2H$$

$$0.4H$$

$$0.8$$ $$H$$

$$0.1$$ $$H$$

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