AIEEE 2004 | Electromagnetic Induction Question 128 | Physics

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

$$0.2H$$

$$0.4H$$

$$0.8$$ $$H$$

$$0.1$$ $$H$$

AIEEE 2003

MCQ (Single Correct Answer)

-1

Two coils are placed close to each other. The mutual inductance of the pair of coils depends upon

the rates at which currents are changing in the two coils

relative position and orientation of the two coils

the currents in the two coils

the materials of the wires of the coils