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JEE PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT

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Application +4 | -1

Two long and parallel straight wires

A

and

B

carrying current

5 \mathrm{~A}

each in same direction. If the force on a

5 \mathrm{~cm}

section of wire

B

is

5 \times 10^{-6}

\mathrm{N}

, then the separation between two wires is (

\mu_0=4 \pi \times 10^{-7}

SI unit)

View answer and explanation

Correct option: A

2.5 \mathrm{~cm}

Option A (2.5 cm) is correct because it correctly applies the formula for the force between two parallel wires.

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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
Reason: Velocity of charge particle is not changing in magnetic field. Pick out the wrong statement : A steady current is flowing in a circular coil of radius

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, then the ratio

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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}