1
WB JEE 2018
MCQ (Single Correct Answer)
+1
-0.25
Change Language
A uniform current is flowing along the length of an infinite, straight, thin, hollow cylinder of radius R. The magnetic field B produced at a perpendicular distance d from the axis of the cylinder is plotted in a graph. Which of the following figures looks like the plot?
A
WB JEE 2018 Physics - Magnetism Question 19 English Option 1
B
WB JEE 2018 Physics - Magnetism Question 19 English Option 2
C
WB JEE 2018 Physics - Magnetism Question 19 English Option 3
D
WB JEE 2018 Physics - Magnetism Question 19 English Option 4
2
WB JEE 2018
MCQ (Single Correct Answer)
+1
-0.25
Change Language
A circular loop of radius r of conducting wire connected with a voltage source of zero internal resistance produces a magnetic field B at its centre. If instead, a circular loop of radius 2r, made of same material, having the same cross-section is connected to the same voltage source, what will be the magnetic field at its centre?
A
$${B \over 2}$$
B
$${B \over 4}$$
C
2B
D
B
3
WB JEE 2018
MCQ (Single Correct Answer)
+2
-0.5
Change Language
A light charged particle is revolving in a circle of radius r in electrostatic attraction of a static heavy particle with opposite charge. How does the magnetic field B at the centre of the circle due to the moving charge depend on r?
A
$$B \propto {1 \over r}$$
B
$$B \propto {1 \over {{r^2}}}$$
C
$$B \propto {1 \over {{r^{3/2}}}}$$
D
$$B \propto {1 \over {{r^{5/2}}}}$$
4
WB JEE 2017
MCQ (Single Correct Answer)
+1
-0.25
Change Language
The magnetic field due to a current in a straight wire segment of length L at a point on its perpendicular bisector at a distance r(r >> L)
A
decreases as $${1 \over r}$$
B
decreases as $${1 \over {{r^2}}}$$
C
decreases as $${1 \over {{r^3}}}$$
D
approaches a finite limit as r $$ \to $$ $$\infty $$
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