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JEE PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT
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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:
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Correct option: C
Option C () is correct because bismuth is a diamagnetic substance, and diamagnetic materials align themselves perpendicular to an external magnetic field.
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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 : 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
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 : 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