1
AIEEE 2005
+4
-1
Two concentric coils each of radius equal to $$2$$ $$\pi$$ $$cm$$ are placed at right angles to each other. $$3$$ ampere and $$4$$ ampere are the currents flowing in each coil respectively . The magnetic induction in Weber / $${m^2}$$ at the center of the coils will be
$$\left( {\mu = 4\pi \times {{10}^{ - 7}}Wb/A.m} \right)$$
A
$${10^{ - 5}}$$
B
$$12 \times {10^{ - 5}}$$
C
$$7 \times {10^{ - 5}}$$
D
$$5 \times {10^{ - 5}}$$
2
AIEEE 2005
+4
-1
A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an electron is projected along the direction of the fields with a certain velocity then
A
its velocity will increase
B
Its velocity will decrease
C
it will turn towards left of a direction of motion
D
it will turn towards right of direction of motion
3
AIEEE 2005
+4
-1
A charged particle of mass $$m$$ and charge $$q$$ travels on a circular path of radius $$r$$ that is perpendicular to a magnetic field $$B.$$ The time taken by the particle to complete one revolution is
A
$${{2\pi {q^2}B} \over m}$$
B
$${{2\pi mq} \over B}$$
C
$${{2\pi m} \over {qB}}$$
D
$${{2\pi qB} \over m}$$
4
AIEEE 2004
+4
-1
A current $$i$$ ampere flows along an infinitely long straight thin walled tube, then the magnetic induction at any point inside the tube is
A
$${{{\mu _0}} \over {4\pi }},{{2i} \over r}$$ tesla
B
zero
C
infinite
D
$${{2i} \over r}$$ tesla
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