AIEEE 2007 | Magnetic Effect of Current Question 179 | 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 charged particle moves through a magnetic field perpendicular to its direction. Then

Kinetic energy changes but the momentum is constant

the momentum changes but the kinetic energy is constant

both momentum and kinetic energy of the particle are not constant

both momentum and kinetic energy of the particle are constant

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

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

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

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

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

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