Magnetism & EMI

Q. If a magnetic field is applied perpendicular to a loop of wire, what is the effect on the induced EMF?
  • A. It is maximum
  • B. It is minimum
  • C. It is zero
  • D. It fluctuates
Q. If a magnetic field is directed into the page and a positive charge moves to the right, what is the direction of the magnetic force acting on the charge?
  • A. Into the page
  • B. Out of the page
  • C. Upward
  • D. Downward
Q. If a magnetic field of 0.1 T is perpendicular to a circular loop of radius 0.1 m, what is the magnetic flux through the loop?
  • A. 0.01 Wb
  • B. 0.03 Wb
  • C. 0.1 Wb
  • D. 0.05 Wb
Q. If a solenoid has n turns per unit length and carries a current I, what is the magnetic field inside the solenoid?
  • A. 0
  • B. μ₀nI
  • C. μ₀I/n
  • D. μ₀I
Q. If a wire carries a current of 5 A and is placed in a magnetic field of 0.1 T, what is the force per unit length on the wire?
  • A. 0.5 N/m
  • B. 1 N/m
  • C. 0.2 N/m
  • D. 0.1 N/m
Q. If a wire carries a current of 5 A, what is the magnetic field at a distance of 0.1 m from the wire?
  • A. 0.1 T
  • B. 0.2 T
  • C. 0.5 T
  • D. 1.0 T
Q. If a wire carrying current I is bent into a semicircular arc of radius R, what is the magnetic field at the center of the arc?
  • A. μ₀I/(4R)
  • B. μ₀I/(2R)
  • C. μ₀I/(8R)
  • D. μ₀I/(πR)
Q. If a wire is bent into a semicircular shape, what is the magnetic field at the center of the semicircle due to current I?
  • A. μ₀I/(4R)
  • B. μ₀I/(2R)
  • C. μ₀I/(πR)
  • D. μ₀I/(8R)
Q. If a wire is bent into a semicircular shape, what is the magnetic field at the center of the semicircle due to the current I?
  • A. μ₀I/(4R)
  • B. μ₀I/(2R)
  • C. μ₀I/(8R)
  • D. μ₀I/(6R)
Q. If the angle between the current element and the line joining the current element to the point of interest is 90 degrees, what is the contribution of that current element to the magnetic field?
  • A. Maximum
  • B. Minimum
  • C. Zero
  • D. Undefined
Q. If the area of a loop in a magnetic field is doubled while keeping the magnetic field strength constant, what happens to the magnetic flux?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It quadruples
Q. If the area of a loop is doubled while keeping the magnetic field constant, how does the magnetic flux change?
  • A. It remains the same
  • B. It doubles
  • C. It triples
  • D. It halves
Q. If the area of a loop is doubled while the magnetic field remains constant, how does the induced EMF change?
  • A. Doubles
  • B. Halves
  • C. Remains the same
  • D. Quadruples
Q. If the current in a circular loop is doubled, how does the magnetic field at the center change?
  • A. Remains the same
  • B. Doubles
  • C. Halves
  • D. Quadruples
Q. If the current in a circular loop is doubled, how does the magnetic field at the center of the loop change?
  • A. It remains the same
  • B. It doubles
  • C. It quadruples
  • D. It halves
Q. If the current in a circular loop is doubled, what happens to the magnetic field at the center?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It quadruples
Q. If the current in a circular loop is increased, what happens to the magnetic field at the center of the loop?
  • A. It decreases
  • B. It increases
  • C. It remains the same
  • D. It becomes zero
Q. If the current in a circular loop is reversed, what happens to the direction of the magnetic field at the center of the loop?
  • A. It remains the same
  • B. It reverses
  • C. It doubles
  • D. It becomes zero
Q. If the current in a coil is doubled, the magnetic field strength around the coil will?
  • A. Double
  • B. Halve
  • C. Remain the same
  • D. Increase by four times
Q. If the current in a coil is reversed, what happens to the direction of the magnetic field produced by the coil?
  • A. It remains the same
  • B. It reverses
  • C. It increases
  • D. It decreases
Q. If the current in a solenoid is doubled, what happens to the magnetic field inside the solenoid?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It quadruples
Q. If the current in a wire is doubled, how does the magnetic field at a point 1 meter away change?
  • A. It doubles
  • B. It quadruples
  • C. It remains the same
  • D. It halves
Q. If the current in a wire is doubled, how does the magnetic field at a point 5 cm away from the wire change?
  • A. It doubles
  • B. It quadruples
  • C. It remains the same
  • D. It halves
Q. If the current in a wire is doubled, how does the magnetic field at a point near the wire change according to Ampere's Law?
  • A. It remains the same
  • B. It doubles
  • C. It quadruples
  • D. It halves
Q. If the current in a wire is doubled, how does the magnetic field at a point near the wire change?
  • A. It remains the same
  • B. It doubles
  • C. It quadruples
  • D. It halves
Q. If the current in a wire is reversed, what happens to the direction of the magnetic field around the wire?
  • A. It remains the same
  • B. It reverses direction
  • C. It becomes zero
  • D. It doubles in strength
Q. If the current in a wire is reversed, what happens to the direction of the magnetic field around it?
  • A. It remains the same
  • B. It reverses
  • C. It doubles
  • D. It becomes zero
Q. If the frequency of an AC source is 60 Hz, what is the time period of the AC signal?
  • A. 0.0167 s
  • B. 0.0333 s
  • C. 0.05 s
  • D. 0.1 s
Q. If the frequency of an AC source is increased, what happens to the capacitive reactance?
  • A. It increases
  • B. It decreases
  • C. It remains the same
  • D. It becomes infinite
Q. If the inductance of a coil is 2 H and the frequency is 50 Hz, what is the inductive reactance?
  • A. 100 π
  • B. 100
  • C. 314
  • D. 628
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