Magnetism & EMI

Q. In which of the following scenarios is the magnetic force on a charged particle zero?
  • A. When the particle is at rest
  • B. When the particle moves parallel to the magnetic field
  • C. When the particle moves perpendicular to the magnetic field
  • D. Both 1 and 2
Q. In which of the following scenarios will a charged particle experience no magnetic force?
  • A. When moving parallel to the magnetic field
  • B. When moving perpendicular to the magnetic field
  • C. When at rest
  • D. Both A and C
Q. In which of the following scenarios will a charged particle experience the maximum magnetic force?
  • A. When moving parallel to the magnetic field
  • B. When moving perpendicular to the magnetic field
  • C. When at rest
  • D. When moving at an angle of 45 degrees
Q. In which of the following scenarios will a charged particle not experience any magnetic force?
  • A. When moving parallel to the magnetic field
  • B. When moving perpendicular to the magnetic field
  • C. When at rest
  • D. Both a and c
Q. In which of the following scenarios will a magnetic field be produced?
  • A. A stationary charge
  • B. A moving charge
  • C. A neutral atom
  • D. A charged particle at rest
Q. Lenz's law states that the direction of induced current is such that it opposes what?
  • A. The change in magnetic flux
  • B. The flow of electric current
  • C. The resistance in the circuit
  • D. The applied voltage
Q. The magnetic field inside a long solenoid is?
  • A. Zero
  • B. Uniform
  • C. Non-uniform
  • D. Depends on the current
Q. The power factor of an AC circuit is defined as the ratio of:
  • A. Real power to apparent power
  • B. Apparent power to real power
  • C. Voltage to current
  • D. Current to voltage
Q. The right-hand rule is used to determine the direction of?
  • A. Magnetic field
  • B. Current
  • C. Force
  • D. All of the above
Q. Two parallel wires carry currents in the same direction. What is the nature of the force between them?
  • A. Attractive
  • B. Repulsive
  • C. No force
  • D. Depends on the current
Q. Two parallel wires carry currents I₁ and I₂ in the same direction. What is the nature of the force between them?
  • A. Attractive
  • B. Repulsive
  • C. Zero
  • D. Depends on distance
Q. Two parallel wires carrying currents I₁ and I₂ in the same direction are separated by a distance d. What is the force per unit length between them?
  • A. (μ₀I₁I₂)/(2πd)
  • B. (μ₀I₁I₂)/(4πd)
  • C. (μ₀I₁I₂)/(8πd)
  • D. (μ₀I₁I₂)/(πd)
Q. Using Biot-Savart Law, what is the direction of the magnetic field produced by a current flowing in a straight wire?
  • A. Radially inward
  • B. Radially outward
  • C. Perpendicular to the wire
  • D. Parallel to the wire
Q. Using Biot-Savart Law, what is the magnetic field at the center of a circular loop of radius R carrying current I?
  • A. μ₀I/(2R)
  • B. μ₀I/(4R)
  • C. μ₀I/(πR)
  • D. μ₀I/(2πR)
Q. What does Ampere's Law relate to in electromagnetism?
  • A. Electric field and charge
  • B. Magnetic field and current
  • C. Electric potential and capacitance
  • D. Magnetic flux and resistance
Q. What does the Biot-Savart Law describe?
  • A. The force between two charges
  • B. The magnetic field generated by a steady current
  • C. The electric field due to a point charge
  • D. The potential energy of a system of charges
Q. What happens to the induced current in a closed loop if the magnetic field through the loop is increasing?
  • A. The induced current flows in a direction to oppose the increase
  • B. The induced current flows in the same direction as the increase
  • C. The induced current becomes zero
  • D. The induced current fluctuates
Q. What happens to the induced current in a coil if the magnetic field is suddenly removed?
  • A. Induced current continues to flow
  • B. Induced current stops immediately
  • C. Induced current increases
  • D. Induced current decreases gradually
Q. What happens to the induced current when the magnetic field is removed from a closed loop?
  • A. It continues to flow indefinitely
  • B. It stops immediately
  • C. It flows in the opposite direction
  • D. It decreases gradually
Q. What happens to the induced current when the magnetic field through a loop is increased?
  • A. The induced current flows in a direction to oppose the increase
  • B. The induced current flows in the same direction as the increase
  • C. The induced current becomes zero
  • D. The induced current fluctuates
Q. What happens to the induced EMF if the area of the coil is increased while the magnetic field strength remains constant?
  • A. It increases
  • B. It decreases
  • C. It remains the same
  • D. It becomes zero
Q. What happens to the induced EMF if the area of the loop in a uniform magnetic field is doubled while keeping the magnetic field constant?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It becomes zero
Q. What happens to the induced EMF if the rate of change of magnetic flux is doubled?
  • A. It remains the same
  • B. It doubles
  • C. It halves
  • D. It quadruples
Q. What happens to the induced EMF if the speed of a conductor moving through a magnetic field is doubled?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It quadruples
Q. What happens to the induced EMF when the area of a loop in a changing magnetic field is increased?
  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Becomes zero
Q. What happens to the induced EMF when the area of a loop in a magnetic field is increased?
  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Depends on the field strength
Q. What happens to the magnetic field inside a long solenoid when the current through it is increased?
  • A. Magnetic field decreases
  • B. Magnetic field remains constant
  • C. Magnetic field increases
  • D. Magnetic field becomes zero
Q. What happens to the magnetic field inside a solenoid if the current is reversed?
  • A. Reverses direction
  • B. Increases
  • C. Decreases
  • D. Remains the same
Q. What happens to the magnetic field inside a solenoid when the current flowing through it is increased?
  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Becomes zero
Q. What happens to the magnetic field inside a solenoid when the current through it is increased?
  • A. It decreases
  • B. It remains constant
  • C. It increases
  • D. It becomes zero
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