AIEEE 2007 | Magnetic Effect of Current Question 178 | 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

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

$${{{\mu _0}} \over {2\pi d}}\left( {I_1^2 + I_2^2} \right)$$

$${{{\mu _0}} \over {2\pi }}{\left( {{{{I_1} + {I_2}} \over d}} \right)^{{1 \over 2}}}$$

$${{{\mu _0}} \over {2\pi d}}{\left( {I_1^2 + I_2^2} \right)^{{1 \over 2}}}$$

$${{{\mu _0}} \over {2\pi d}}\left( {{I_1} + {I_2}} \right)$$

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

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