Free Magnetic Flux Density MCQs with Answers
96 Magnetic Flux Density MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Magnetic flux density measures the magnetic force acting on a current carrying conductor or moving charge in a magnetic field. Work includes the relations B equals F divided by IL and F equals qvB, the tesla as its SI unit, field direction and the distinction between flux density and magnetic flux.
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96 questions · page 3 of 5
- A. B = μonI
- B. B = μoN/L
- C. B = μoIN
- D. B = μoINL
Explanation: B = μonl is the formula for magnetic field across a solenoid.
Correct answer: B = μonI- A. Henry
- B. Henry/m
- C. Dimensionless
- D. Henry/sq.m
Explanation: Relative permeability is known to be a dimensionless quantity and it is the ratio of two quantities with the same units, and hence, the…
Correct answer: Dimensionless- A. BA=3BB
- B. BA=(BB)/3
- C. BA=BB
- D. BA=4BB
Explanation: Magnetic field in solenoid is independent of length and cross section area;B= 𝛍 nIn=I/Ln= number of turnsI=currentL=lengthB magnetic flux…
Correct answer: BA=BB- A. 75 x 10^7 T
- B. 60 x 10+3 T
- C. 4π x 10-3
- D. 750π x 10+3
Explanation: The magnetic field inside a solenoid is given by the formula:B=μ0nIwhere:B = Magnetic field (T)μ0 = Permeability of free space (4π×10−7n =…
Correct answer: 4π x 10-3- A. Its length
- B. Its length and current in it
- C. Its length and number of turns in it
- D. The number of turns and current in it
Explanation: The correct answer is The number of turns and current in it. The magnetic field strength inside a solenoid is determined by the product of…
Correct answer: The number of turns and current in it- A. Normal to the solenoid
- B. The axis of the solenoid
- C. Can't be taken
- D. None of the above
Explanation: Option A: The magnetic field inside a solenoid is parallel to the axis of the solenoid, so the magnetic field is not normal to the…
Correct answer: The axis of the solenoid- A. varying with radial distance
- B. uniform
- C. zero
- D. not enough information
Explanation: A long straight coil of wire can be used to generate a nearly uniform magnetic field similar to that of a bar magnet.
Correct answer: zero- A. Minimum
- B. Maximum
- C. None of these
- D. Zero
Explanation: Inside a solenoid, the magnetic field lines are parallel and very close to each other.
Correct answer: Maximum- A. 4π x 10⁻⁷Wb/Am
- B. 4π x 10⁷Wb/Am
- C. 10⁻⁷Wb/Am
- D. 4πx 10⁻⁶Wb/Am
Explanation: The permeability of free space, μ0, is a physical constant used often in electromagnetism.
Correct answer: 4π x 10⁻⁷Wb/Am- A. Resistor
- B. Capacitor
- C. Inductor
- D. Toroid
Explanation: This is a fact to be memorized. A solenoid bent into a circle is called a toroid. Hence, Option D is correct.
Correct answer: Toroid- A. Magnetic flux density will be halved
- B. Magnetic flux density increases by different amount at different points
- C. Magnetic flux density remains unchanged
- D. Magnetic flux density will be doubled
Explanation: When the number of turns N is doubled but the solenoid length L also doubles, the magnetic flux density B=μ0(NI/L) remains the same.
Correct answer: Magnetic flux density remains unchanged- A. Momentum
- B. Torque
- C. Force
- D. Impulse
Explanation: The working principle of a galvanometer is indeed based on the torque that acts on a current-carrying coil placed within a magnetic field.
Correct answer: Torque- A. Wb.m-2
- B. Wb.m2
- C. NAm-1
- D. NmA-1
Explanation: The unit of magnetic flux density is indeed expressed as Weber per square meter (Wb.m-2).
Correct answer: Wb.m-2- A. using a small and thick suspension wire
- B. decreasing the area of the coil
- C. Increasing the magnetic field
- D. reducing the number of turns of the coil
Explanation: The formula for the current sensitivity of a galvanometer is given by: I=cθ/ NAB So, it can enhance the galvanometer's ability to detect…
Correct answer: Increasing the magnetic field- A. 5N
- B. 4N
- C. 2N
- D. 1.5N
Explanation: The force on a wire carrying a current in a magnetic field can be calculated using the formula: F=BILsinθwhere:F is the force,B is the…
Correct answer: 2N- A. Larger
- B. Smaller
- C. Zero
- D. Infinite
Explanation: To make a galvanometer more sensitive, C/(BAN) should be made smaller. This means that for a given current, the galvanometer will show a…
Correct answer: Smaller- A. Iron
- B. Wood
- C. Cobalt
- D. Nickel
Explanation: Nickel, cobalt, and iron are ferromagnetic materials, meaning they can be magnetized or attracted to a magnet.
Correct answer: Wood- A. electric field.
- B. area of the loop.
- C. amount of the current.
- D. direction of the current.
Explanation: A) electric field: The formula for torque on a current-carrying coil in a magnetic field does not involve the electric field.
Correct answer: electric field.- A. be zero.
- B. be maximum.
- C. remain constant.
- D. vary unpredictably.
Explanation: * The force (F) experienced by a current-carrying conductor in a magnetic field is given by the formula: F = I * L * B * sin(theta) Where…
Correct answer: be maximum.- A. area of the coil.
- B. material of the coil.
- C. total number of turns in the coil.
- D. amount of current passing through the coil.
Explanation: The correct answer is Option D: amount of current passing through the coil.
Correct answer: amount of current passing through the coil.