AIEEE 2004 | Magnetic Effect of Current Question 190 | Physics

A long wire carries a steady current. It is bent into a circle of one turn and the magnetic field at the centre of the coil is $$B.$$ It is then bent into a circular loop of $$n$$ turns. The magnetic field at the center of the coil will be

$$2n$$ $$B$$

$${n^2}\,B$$

$$nB$$

$$2{n^2}\,B$$

AIEEE 2004

MCQ (Single Correct Answer)

-1

The magnetic field due to a current carrying circular loop of radius $$3$$ $$cm$$ at a point on the axis at a distance of $$4$$ $$cm$$ from the centre is $$54\,\mu T.$$ What will be its value at the center of loop?

$$125\,\mu T$$

$$150\,\mu T$$

$$250\,\mu T$$

$$75\,\mu T$$

AIEEE 2004

MCQ (Single Correct Answer)

-1

Two long conductors, separated by a distance $$d$$ carry current $${I_1}$$ and $${I_2}$$ in the same direction. They exert a force $$F$$ on each other. Now the current in one of them is increased to two times and its direction is reversed. The distance is also increased to $$3d$$. The new value of the force between them is

$$ - {{2F} \over 3}$$

$${F \over 3}$$

$$-2F$$

$$ - {F \over 3}$$

AIEEE 2003

MCQ (Single Correct Answer)

-1

A particle of mass $$M$$ and charge $$Q$$ moving with velocity $$\overrightarrow v $$ describe a circular path of radius $$R$$ when subjected to a uniform transverse magnetic field of induction $$B.$$ The network done by the field when the particle completes one full circle is

$$\left( {{{M{v^2}} \over R}} \right)2\pi R$$

zero

$$B\,\,Q\,2\pi R$$

$$B\,Qv\,2\pi R$$

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