alleryThe magnetic force on a stationary charge in a magnetic field is:
- qB
- qvB
- zero
- q/B
Show answer and solution
Correct answer: C. zero
v = 0 ⇒ F = qvB = 0.
NEET UG Magnetism and Matter — practice questions
Explore 61 free Magnetism and Matter questions in NEET UG Physics. Open each question or exercise to read its content, reference answers and available explanation.
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The magnetic force on a stationary charge in a magnetic field is:Read the answer and worked solution →A charged particle moving in a uniform magnetic field perpendicular to B describes a:Read the answer and worked solution →The radius of circular motion of a particle of charge q, mass m, speed v in field B (perpendicular) is:Read the answer and worked solution →The cyclotron frequency (angular) of a charged particle in field B is:Read the answer and worked solution →In a velocity selector (crossed E and B), a particle passes undeflected if v equals:Read the answer and worked solution →The Biot–Savart law gives the magnetic field due to an element of current as proportional to:Read the answer and worked solution →The magnitude of the magnetic field at the centre of a circular current loop of radius R carrying current I is:Read the answer and worked solution →The magnetic field at a distance r from a long straight current-carrying wire is:Read the answer and worked solution →Magnetic field inside a long ideal solenoid with n turns per unit length carrying current I is:Read the answer and worked solution →For a toroid with N total turns, mean radius r, carrying current I, the magnetic field inside is:Read the answer and worked solution →Ampere's circuital law in integral form states ∮ B · dl equals:Read the answer and worked solution →The magnetic force per unit length between two parallel wires carrying currents I₁ and I₂ separated by distance d is:Read the answer and worked solution →Two parallel wires carrying currents in the same direction:Read the answer and worked solution →Two parallel wires carrying currents in opposite directions:Read the answer and worked solution →The magnetic moment of a current loop with area A and current I is:Read the answer and worked solution →Torque on a magnetic dipole moment m in uniform field B is:Read the answer and worked solution →Potential energy of a magnetic dipole m in field B is:Read the answer and worked solution →The SI unit of magnetic field B is:Read the answer and worked solution →A galvanometer measures small currents using the principle that the torque on a coil in a magnetic field is proportional to:Read the answer and worked solution →A moving coil galvanometer uses a radial magnetic field so that:Read the answer and worked solution →Magnetic field at the centre of a current-carrying square loop is greater than at the centre of a circular loop of the same perimeter:Read the answer and worked solution →The magnetic field along the axis of a long current-carrying wire is:Read the answer and worked solution →Magnetic monopoles, as isolated magnetic charges, have so far been:Read the answer and worked solution →The unit of magnetic flux is the:Read the answer and worked solution →Magnetic field inside an ideal solenoid is:Read the answer and worked solution →Force on a current-carrying wire of length L placed in field B at angle θ to it is:Read the answer and worked solution →The unit ratio μ0 ε0 has the same dimensions as:Read the answer and worked solution →Sort the magnetic materialsRead the answer and worked solution →Paramagnetic and ferromagneticRead the answer and worked solution →One word is wrongRead the answer and worked solution →
Worked practice questions
A charged particle moving in a uniform magnetic field perpendicular to B describes a:
- straight line
- parabola
- circle
- helix
Show answer and solution
Correct answer: C. circle
Perpendicular B and v ⇒ circular motion.
The radius of circular motion of a particle of charge q, mass m, speed v in field B (perpendicular) is:
- qB/(mv)
- mv/(qB)
- mvB/q
- v/(qBm)
Show answer and solution
Correct answer: B. mv/(qB)
qvB = mv²/r ⇒ r = mv/(qB).
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