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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): The restoring couple in the moving coil galvanometer is due to the current in the coil
Statement(B): Wires of magnetic field around a current carrying straight conductor will be circular in a plane parallel to the conductor
Statement(C): When a charged particle enters a uniform magnetic field, its kinetic energy increases
Statement(B): Wires of magnetic field around a current carrying straight conductor will be circular in a plane parallel to the conductor
Statement(C): When a charged particle enters a uniform magnetic field, its kinetic energy increases
View answer and explanation
Correct option: D
A, B, C are false
Option D is correct because all three statements (A, B, and C) are false based on the principles of moving coil galvanometers, magnetic fields, and charged particle motion in magnetic fields.
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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 :