AIEEE 2007 | Magnetic Effect of Current Question 222 | Physics

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

$$1/2$$

$$1/4$$

$$4$$

$$1$$

AIEEE 2007

MCQ (Single Correct Answer)

-1

A current $$I$$ flows along the length of an infinitely long, straight, thin walled pipe. Then

the magnetic field at all points inside the pipe is the same, but not zero

the magnetic field is zero only on the axis of the pipe

the magnetic field is different at different points inside the pipe

the magnetic field at any point inside the pipe is zero

AIEEE 2006

MCQ (Single Correct Answer)

-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

helix

straight line

ellipse

circle

AIEEE 2006

MCQ (Single Correct Answer)

-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

$$1.05 \times {10^{ - 2}}\,\,Weber/{m^2}$$

$$1.05 \times {10^{ - 5}}\,\,Weber/{m^2}$$

$$1.05 \times {10^{ - 3}}\,\,Weber/{m^2}$$

$$1.05 \times {10^{ - 4}}\,\,Weber/{m^2}$$

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