1
WB JEE 2021
MCQ (Single Correct Answer)
+1
-0.25
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WB JEE 2021 Physics - Magnetism Question 11 English
Consider two infinitely long wires parallel to Z-axis carrying same current I in the positive z-direction. One wire passes through the point L at coordinates ($$-$$1, +1) and the other wire passes through the point M at coordinates ($$-$$1, $$-$$1). The resultant magnetic field at the origin O will be
A
$${{{\mu _0}I} \over {2\sqrt 2 \pi }}\widehat j$$
B
$${{{\mu _0}I} \over {2\pi }}\widehat j$$
C
$${{{\mu _0}I} \over {2\sqrt 2 \pi }}\widehat i$$
D
$${{{\mu _0}I} \over {4\pi }}\widehat i$$
2
WB JEE 2021
MCQ (Single Correct Answer)
+1
-0.25
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A thin charged rod is bent into the shape of a small circle of radius R, the charge per unit length of the rod being $$\lambda$$. The circle is rotated about its axis with a time period T and it is found the magnetic field at a distance d away (d >> R) from the centre and on the axis, varies as $$R^m \over d^n$$. The values of m and n respectively are
A
m = 2, n = 2
B
m = 2, n = 3
C
m = 3, n = 2
D
m = 3, n = 3
3
WB JEE 2021
MCQ (Single Correct Answer)
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WB JEE 2021 Physics - Magnetism Question 9 English
For two types of magnetic materials A and B, variation of $$1\over\chi$$ ($$\chi$$ : susceptibility) versus temperature T is shown in the figure. Then,
A
A is diamagnetic and B is paramagnetic.
B
A is feromagnetic and B is diamagnetic.
C
A is paramagnetic and B is feromagnetic.
D
A is paramagnetic and B is diamagnetic.
4
WB JEE 2021
MCQ (Single Correct Answer)
+1
-0.25
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WB JEE 2021 Physics - Alternating Current Question 3 English
The rms value of potential difference V shown in the figure is
A
$${{{V_0}} \over 2}$$
B
V0
C
$${{{V_0}} \over {\sqrt 3 }}$$
D
$${{{V_0}} \over {\sqrt 2 }}$$
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