If the current in the toroidal solenoid increase uniformly from zero to $6.0 \mathrm{~A}$ in $3.0 \mu \mathrm{s}$. Self inductance of the toroidal solenoid is $40 \mu \mathrm{H}$. The magnitude of self induced emf is

JEE PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT

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If the current in the toroidal solenoid increase uniformly from zero to

6.0 \mathrm{~A}

3.0 \mu \mathrm{s}

. Self inductance of the toroidal solenoid is

40 \mu \mathrm{H}

. The magnitude of self induced emf is

View answer and explanation

Correct option: A

80 \mathrm{~V}

Option B (12.5 N) is correct because the reaction at the hinge is calculated by considering the torque due to the weight of the rod and the resulting angular acceleration when the string is cut.

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

X

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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

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R_2

respectively. The ratio of mass of

{X}

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{Y}

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