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JEE PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT
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Medium
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Understanding
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Statement-A: When a charge particle of charge '' moves with a velocity in magnetic field of induction then force acting on it
Statement-B: An electron is projected in a magnetic field along the lines of force then their will be no effect on the motion of electron.
Statement-B: An electron is projected in a magnetic field along the lines of force then their will be no effect on the motion of electron.
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Correct option: D
Both A and B are true
Option D (Both A and B are true) is correct because Statement A correctly states the Lorentz force, and Statement B is true since the magnetic force is zero when the electron moves parallel to the magnetic field.
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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 , made up of a thin conducting wire. The magnetic field at the center of the loop is . Now, a circular loop of radius is made from the same wire without changing its length, by unfolding and refolding the loop, and the same current is passed through it. If new magnetic field at the center of the coil is , then the ratio is Lorentz force can be calculated by using the formula Two particles and having equal charges, after being accelerated through the same potential difference, enter a region of uniform magnetic field and describe circular path of radius and respectively. The ratio of mass of to that of is :
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 , made up of a thin conducting wire. The magnetic field at the center of the loop is . Now, a circular loop of radius is made from the same wire without changing its length, by unfolding and refolding the loop, and the same current is passed through it. If new magnetic field at the center of the coil is , then the ratio is Lorentz force can be calculated by using the formula Two particles and having equal charges, after being accelerated through the same potential difference, enter a region of uniform magnetic field and describe circular path of radius and respectively. The ratio of mass of to that of is :