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.
AP Intermediate 2nd Year Magnetism and Matter — practice questions
Explore 14 free Magnetism and Matter questions in AP Intermediate 2nd Year Physics. Open each question or exercise to read its content, reference answers and available explanation.
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Showing questions 1–14 of 14.
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 →
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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