If the area of a loop in a magnetic field is doubled while keeping the magnetic

Practice Questions

Q1
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?
  1. It doubles
  2. It halves
  3. It remains the same
  4. It quadruples

Questions & Step-by-Step Solutions

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?
Correct Answer: Magnetic flux doubles.
  • Step 1: Understand what magnetic flux (Φ) is. It is the product of the magnetic field strength (B) and the area (A) through which the field lines pass.
  • Step 2: Write down the formula for magnetic flux: Φ = B * A.
  • Step 3: Identify that the magnetic field strength (B) is constant in this scenario.
  • Step 4: Note that the area (A) of the loop is being doubled. This means if the original area is A, the new area will be 2A.
  • Step 5: Substitute the new area into the formula: Φ = B * (2A).
  • Step 6: Simplify the equation: Φ = 2 * (B * A).
  • Step 7: Recognize that B * A is the original magnetic flux, so the new magnetic flux is double the original flux.
  • Step 8: Conclude that if the area is doubled while keeping the magnetic field strength constant, the magnetic flux also doubles.
  • Magnetic Flux – Magnetic flux (Φ) is the product of the magnetic field strength (B) and the area (A) through which the field lines pass, represented by the formula Φ = B * A.
  • Area and Magnetic Flux Relationship – Doubling the area while keeping the magnetic field strength constant directly affects the magnetic flux, leading to a proportional increase.
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