1
JEE Main 2014 (Offline)
MCQ (Single Correct Answer)
+4
-1
A conductor lies along the $$z$$-axis at $$ - 1.5 \le z < 1.5\,m$$ and carries a fixed current of $$10.0$$ $$A$$ in $$ - {\widehat a_z}$$ direction (see figure). For a field $$\overrightarrow B = 3.0 \times {10^{ - 4}}\,{e^{ - 0.2x}}\,\,{\widehat a_y}\,\,T,$$ find the power required to move the conductor at constant speed to $$x=2.0$$ $$m$$, $$y=0$$ $$m$$ in $$5 \times {10^{ - 3}}s.$$ Assume parallel motion along the $$x$$-axis. JEE Main 2014 (Offline) Physics - Magnetic Effect of Current Question 169 English
A
$$1.57W$$
B
$$2.97W$$
C
$$14.85$$ $$W$$
D
$$29.7W$$
2
AIEEE 2012
MCQ (Single Correct Answer)
+4
-1
Proton, deuteron and alpha particle of same kinetic energy are moving in circular trajectories in a constant magnetic field. The radii of proton, denuteron and alpha particle are respectively $${r_p},{r_d}$$ and $${r_\alpha }$$. Which one of the following relation is correct?
A
$${r_\alpha } = {r_p} = {r_d}$$
B
$${r_\alpha } = {r_p} < {r_d}$$
C
$${r_\alpha } > {r_d} > {r_p}$$
D
$${r_\alpha } = {r_d} > {r_p}$$
3
AIEEE 2012
MCQ (Single Correct Answer)
+4
-1
A charge $$Q$$ is uniformly distributed over the surface of non-conducting disc of radius $$R.$$ The disc rotates about an axis perpendicular to its plane and passing through its center with an angular velocity $$\omega .$$ As a result of this rotation a magnetic field of induction $$B$$ is obtained at the center of the disc. If we keep both the amount of charge placed on the disc and its angular velocity to be constant and very the radius of the disc then the variation of the magnetic induction at the center of the disc will be represented by the figure :
A
AIEEE 2012 Physics - Magnetic Effect of Current Question 170 English Option 1
B
AIEEE 2012 Physics - Magnetic Effect of Current Question 170 English Option 2
C
AIEEE 2012 Physics - Magnetic Effect of Current Question 170 English Option 3
D
AIEEE 2012 Physics - Magnetic Effect of Current Question 170 English Option 4
4
AIEEE 2011
MCQ (Single Correct Answer)
+4
-1
A current $$I$$ flows in an infinitely long wire with cross section in the form of a semi-circular ring of radius $$R.$$ The magnitude of the magnetic induction along its axis is:
A
$${{{\mu _0}I} \over {2{\pi ^2}R}}$$
B
$${{{\mu _0}I} \over {2\pi R}}$$
C
$${{{\mu _0}I} \over {4\pi R}}$$
D
$${{{\mu _0}I} \over {{\pi ^2}R}}$$
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