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AP Intermediate 2nd Year Moving Charges and Magnetism — practice questions — page 5

Explore 188 free Moving Charges and Magnetism 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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Moving Charges and Magnetism questions and exercises with answers

Showing questions 121–150 of 188.

At the very end of a long solenoid, the magnetic field along the axis isRead the answer and worked solution →A magnetic dipole with moment m makes angle θ with a uniform field B. The torque on the dipole has magnitudeRead the answer and worked solution →An electron moves east in a magnetic field directed north. The magnetic force on the electron pointsRead the answer and worked solution →A cyclotron operates at frequency f in a magnetic field B. The charge-to-mass ratio of the accelerated ion isRead the answer and worked solution →Cyclotrons are not used to accelerate electrons becauseRead the answer and worked solution →A charge q moves with velocity v through a region with electric field E and magnetic field B. The net electromagnetic force on it isRead the answer and worked solution →Reading the Lorentz forceRead the answer and worked solution →Force on a current wireRead the answer and worked solution →The current carrying conductorRead the answer and worked solution →The cyclotron machineRead the answer and worked solution →Formula to what it describesRead the answer and worked solution →Using Biot-SavartRead the answer and worked solution →Odd one out: magnetismRead the answer and worked solution →Which is largerRead the answer and worked solution →Odd one out: what a current doesRead the answer and worked solution →Zero work, changing directionRead the answer and worked solution →Moving charges, mixed checkRead the answer and worked solution →A circular coil of N turns and radius R carries current I. Its magnetic dipole moment isRead the answer and worked solution →The Lorentz forceRead the answer and worked solution →A long solenoid has 1000 turns per metre and carries 2 A. The magnetic field strength inside isRead the answer and worked solution →A square coil of side 0.1 m, with 50 turns, carries 1 A in a 0.2 T field. The maximum torque on the coil isRead the answer and worked solution →Charge in a uniform fieldRead the answer and worked solution →Count and computeRead the answer and worked solution →Field of a circular coilRead the answer and worked solution →Two long parallel wires 0.1 m apart carry 5 A and 10 A in the same direction. The force per unit length on each wire isRead the answer and worked solution →The self-inductance of a long air-cored solenoid of length $\ell$, cross-sectional area $A$ and total number of turns $N$ is:Read the answer and worked solution →Complete the magnet ruleRead the answer and worked solution →Sort the magnetic materialsRead the answer and worked solution →Order what happens to domainsRead the answer and worked solution →Substances that are weakly magnetised in a field are:Read the answer and worked solution →

Worked practice questions

At the very end of a long solenoid, the magnetic field along the axis is

  1. μ₀nI
  2. μ₀nI/2
  3. 2μ₀nI
  4. Zero
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Correct answer: B. μ₀nI/2

1. The on-axis field of a finite solenoid involves angles subtended at its two ends. 2. Deep inside (both ends far), the formula gives B = μ₀nI. 3. At an end face, one angle is 90° while the other approaches 0°. 4. The field at the end of a long solenoid is therefore B = μ₀nI/2, half the interior value. _Source: syllabus Physics Ch 4 "Moving Charges and Magnetism", §4.8.1_

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A magnetic dipole with moment m makes angle θ with a uniform field B. The torque on the dipole has magnitude

  1. mB cos θ
  2. mB sin θ
  3. mB tan θ
  4. mB
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Correct answer: B. mB sin θ

1. The torque on a magnetic dipole in a uniform field is τ = m × B. 2. The magnitude is |τ| = mB sin θ, where θ is the angle between m and B. 3. Torque is maximum when m is perpendicular to B (θ = 90°). 4. Torque is zero when m is aligned with B (θ = 0°), the stable orientation. _Source: syllabus Physics Ch 4 "Moving Charges and Magnetism", §4.10_

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An electron moves east in a magnetic field directed north. The magnetic force on the electron points

  1. directed up
  2. directed down
  3. directed east
  4. zero
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Correct answer: B. directed down

1. The magnetic force on a charge is F = qv × B. 2. Take east as +x, north as +y, up as +z. Then v × B = x̂ × ŷ = ẑ (upward). 3. For a positive charge, the force would be upward; for the electron (charge -e), the force flips direction. 4. So the magnetic force on the electron points downward. _Source: syllabus Physics Ch 4 "Moving Charges and Magnetism", §4.2.2_

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