1
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
A material $$'B'$$ has twice the specific resistance of $$'A'.$$ A circular wire made of $$'B'$$ has twice the diameter of a wire made of $$'A'$$. Then for the two wires to have the same resistance, the ratio $${l \over B}/{l \over A}$$ of their respective lengths must be
A
$$1$$
B
$${l \over 2}$$
C
$${l \over 4}$$
D
$$2$$
2
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
Curie temperature is the temperature above which
A
a ferromagnetic material becomes paramagnetic
B
a paramagnetic material becomes diamagnetic
C
a ferromagnetic material becomes diamagnetic
D
a paramagnetic material becomes ferromagnetic
3
AIEEE 2004
MCQ (Single Correct Answer)
+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
$$2{n^2}\,B$$
4
AIEEE 2004
MCQ (Single Correct Answer)
+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
$$75\,\mu T$$
JEE Main Papers
2023
2021
EXAM MAP