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JEE PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT
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Medium
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Analyzing
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Statement (I): A uniform electric field and a
uniform magnetic field are pointed in the same
direction. If an electron is projected in the same
direction the electron velocity will decrease in
magnitude.
Statement (II): Two infinite long parallel wires
are carrying current in the same direction. The
magnetic field at a point midway between the wires
is zero.
Statement (III): No net force acts on a rectangular
coil carrying a steady current when suspended in
a uniform magnetic field.
Which of the following is correct?
uniform magnetic field are pointed in the same
direction. If an electron is projected in the same
direction the electron velocity will decrease in
magnitude.
Statement (II): Two infinite long parallel wires
are carrying current in the same direction. The
magnetic field at a point midway between the wires
is zero.
Statement (III): No net force acts on a rectangular
coil carrying a steady current when suspended in
a uniform magnetic field.
Which of the following is correct?
View answer and explanation
Correct option: A
Statement I, II and III are true
Option A (Statement I, II and III are true) is correct because all three statements accurately describe physical phenomena related to electric and magnetic fields.
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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 :