1
AIEEE 2007
MCQ (Single Correct Answer)
+4
-1
A long straight wire of radius $$a$$ carries a steady current $$i.$$ The current is uniformly distributed across its cross section. The ratio of the magnetic field at $$a/2$$ and $$2a$$ is
A
$$1/2$$
B
$$1/4$$
C
$$4$$
D
$$1$$
2
AIEEE 2007
MCQ (Single Correct Answer)
+4
-1
Two identical conducting wires $$AOB$$ and $$COD$$ are placed at right angles to each other. The wire $$AOB$$ carries an electric current $${I_1}$$ and $$COD$$ carries a current $${I_2}$$. The magnetic field on a point lying at a distance $$d$$ from $$O$$, in a direction perpendicular to the plane of the wires $$AOB$$ and $$COD$$ , will be given by
A
$${{{\mu _0}} \over {2\pi d}}\left( {I_1^2 + I_2^2} \right)$$
B
$${{{\mu _0}} \over {2\pi }}{\left( {{{{I_1} + {I_2}} \over d}} \right)^{{1 \over 2}}}$$
C
$${{{\mu _0}} \over {2\pi d}}{\left( {I_1^2 + I_2^2} \right)^{{1 \over 2}}}$$
D
$${{{\mu _0}} \over {2\pi d}}\left( {{I_1} + {I_2}} \right)$$
3
AIEEE 2006
MCQ (Single Correct Answer)
+4
-1
In a region, steady and uniform electric and magnetic fields are present. These two fields are parallel to each other. A charged particle is released from rest in this region. The path of the particle will be a
A
helix
B
straight line
C
ellipse
D
circle
4
AIEEE 2006
MCQ (Single Correct Answer)
+4
-1
A long solenoid has $$200$$ turns per $$cm$$ and carries a current $$i.$$ The magnetic field at its center is $$6.28 \times {10^{ - 2}}\,\,\,Weber/{m^2}.$$ Another long solenoid has $$100$$ turns per $$cm$$ and it carries a current $${i \over 3}$$. The value of the magnetic field at its center is
A
$$1.05 \times {10^{ - 2}}\,\,Weber/{m^2}$$
B
$$1.05 \times {10^{ - 5}}\,\,Weber/{m^2}$$
C
$$1.05 \times {10^{ - 3}}\,\,Weber/{m^2}$$
D
$$1.05 \times {10^{ - 4}}\,\,Weber/{m^2}$$
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