1
AIEEE 2006
+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
$$1.05 \times {10^{ - 4}}\,\,Weber/{m^2}$$
2
AIEEE 2005
+4
-1
Two thin, long, parallel wires, separated by a distance $$'d'$$ carry a current of $$'i'$$ $$A$$ in the same direction. They will
A
repel each other with a force of $${\mu _0}{i^2}/\left( {2\pi d} \right)$$
B
attract each other with a force of $${\mu _0}{i^2}/\left( {2\pi d} \right)$$
C
repel each other with a force $$_0{i^2}/\left( {2\pi {d^2}} \right)$$
D
attract each other with a force of $${\mu _0}{i^2}/\left( {2\pi {d^2}} \right)$$
3
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
$$5 \times {10^{ - 5}}$$
4
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
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