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JEE PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT
1
Medium
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Understanding
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Assertion : In electric circuits, wires carrying
currents in opposite directions are often twisted
together.
Reason: If the wires are not twisted together, the
combination of the wires forms a current loop, the
magnetic field generated by the loop might affect
adjacent circuits or components
currents in opposite directions are often twisted
together.
Reason: If the wires are not twisted together, the
combination of the wires forms a current loop, the
magnetic field generated by the loop might affect
adjacent circuits or components
View answer and explanation
Correct option: A
If both Assertion and Reason are correct and the
Reason is a correct explanation of the Assertion
Reason is a correct explanation of the Assertion
Option A is correct because twisting wires carrying current in opposite directions minimizes the magnetic field they produce, preventing interference with nearby circuits.
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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 :