1
JEE Main 2019 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A current loop, having two circular arcs joined by two radial lines is shown in the figure. It carries a current of 10 A. The magnetic field at point O will be close to :

JEE Main 2019 (Online) 9th January Morning Slot Physics - Magnetic Effect of Current Question 138 English
A
1.0 $$ \times $$ 10$$-$$7 T
B
1.5 $$ \times $$ 10$$-$$7 T
C
1.5 $$ \times $$ 10$$-$$5 T
D
1.0 $$ \times $$ 10$$-$$5 T
2
JEE Main 2019 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
An infinitely long current carrying wire and a small current carrying loop are in the plane of the paper as shown. The radius of the loop is a and distance of its centre from the wire is d (d > > a). If the loop a applies a force F on the wire then :

JEE Main 2019 (Online) 9th January Morning Slot Physics - Magnetic Effect of Current Question 137 English
A
$$F = 0$$
B
$$F \propto \left( {{a \over d}} \right)$$
C
$$F \propto \left( {{{{a^2}} \over {{d^3}}}} \right)$$
D
$$F \propto {\left( {{a \over d}} \right)^2}$$
3
JEE Main 2018 (Online) 16th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A charge q is spread uniformly over an insulated loop of radius r. If it is rotated with an angular velocity $$\omega $$ with resect to normal axis then the magnetic moment of the loop is :
A
q $$\omega $$r2
B
$${4 \over 3}$$ q $$\omega $$r2
C
$${3 \over 2}$$ q $$\omega $$r2
D
$${1 \over 2}$$ q $$\omega $$r2
4
JEE Main 2018 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
An electron, a proton and an alpha particle having the same kinetic energy are moving in circular orbits of radii re, rp, r$$_\alpha$$ respectively in a uniform magnetic field B. The relation between re, rp, r$$_\alpha$$ is:
A
re < r$$_\alpha$$ < rp
B
re > rp = r$$_\alpha$$
C
re < rp = r$$_\alpha$$
D
re < rp < r$$_\alpha$$
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