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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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When a current carrying coil is placed in a uniform magnetic field with its magnetic moment anti-parallel to the field
a) Torque on it is maximum
b) Torque on it is zero
c) Potential energy is maximum
d) Dipole is in unstable equilibrium
a) Torque on it is maximum
b) Torque on it is zero
c) Potential energy is maximum
d) Dipole is in unstable equilibrium
View answer and explanation
Correct option: A
b, c, d are correct
Option A (b, c, d are correct) is correct because when the magnetic moment is anti-parallel to the field, the torque is zero, potential energy is maximum, and the dipole is in unstable equilibrium.
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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 :