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JEE PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT

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Application +4 | -1

A current of

10 \mathrm{~A}

is flowing east to west in a long wire kept horizontally in the east-west direction. Find magnetic field in a horizontal plane at a distance of (i)

10 \mathrm{~cm}

north (ii)

20 \mathrm{~cm}

south from the wire

View answer and explanation

Correct option: A

2 \times 10^{-5} \mathrm{~T};\,\,1 \times 10^{-5} \mathrm{~T}

Option A (

2 \times 10^{-5} \mathrm{~T};\,\,1 \times 10^{-5} \mathrm{~T}

) is correct because it is calculated by using the formula for the magnetic field around a long straight wire at the specified distances.

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A needle made of bismuth is suspended freely in a magnetic field. The angle which the needle makes with the magnetic field is: Assertion: If a charged particles is moving in perpendicular uniform magnetic field, its kinetic energy does not change
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R

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B_L

. Now, a circular loop of radius

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B_C

, then the ratio

B_L / B_C

is Lorentz force can be calculated by using the formula Two particles

X

Y

having equal charges, after being accelerated through the same potential difference, enter a region of uniform magnetic field and describe circular path of radius

R_1

R_2

respectively. The ratio of mass of

{X}

{Y}