1
AIEEE 2004
+4
-1
A current $$i$$ ampere flows along an infinitely long straight thin walled tube, then the magnetic induction at any point inside the tube is
A
$${{{\mu _0}} \over {4\pi }},{{2i} \over r}$$ tesla
B
zero
C
infinite
D
$${{2i} \over r}$$ tesla
2
AIEEE 2004
+4
-1
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
A
$$2n$$ $$B$$
B
$${n^2}\,B$$
C
$$nB$$
D
$$2{n^2}\,B$$
3
AIEEE 2004
+4
-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?
A
$$125\,\mu T$$
B
$$150\,\mu T$$
C
$$250\,\mu T$$
D
$$75\,\mu T$$
4
AIEEE 2004
+4
-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
A
$$- {{2F} \over 3}$$
B
$${F \over 3}$$
C
$$-2F$$
D
$$- {F \over 3}$$
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