AIEEE 2004 | Electromagnetic Induction Question 121 | Physics

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

AIEEE 2002

MCQ (Single Correct Answer)

-1

A conducting square loop of side $$L$$ and resistance $$R$$ moves in its plane with a uniform velocity $$v$$ perpendicular to one of its sides. A magnetic induction $$B$$ constant in time and space, pointing perpendicular and into the plane at the loop exists everywhere with half the loop outside the field, as shown in figure. The induced $$emf$$ is AIEEE 2002 Physics - Electromagnetic Induction Question 111 English