Magnetism and Electromagnetic Induction MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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The magnetic field lines inside a toroid are:
A. Concentric circles
B. Straight lines
C. Radial lines
D. Spiral lines
Answer: Concentric circles
The phenomenon where a changing magnetic field induces a current in a conductor is known as:
A. Electromagnetic induction
B. Electrostatic induction
C. Magnetic resonance
D. Capacitive reactance
Answer: Electromagnetic induction
The magnetic field strength is maximum at:
A. The poles of a magnet
B. The center of a solenoid
C. The equator of the Earth
D. The edges of a bar magnet
Answer: The poles of a magnet
The magnetic field due to a straight current-carrying conductor decreases with distance according to:
A. Inverse proportionality to the distance
B. Direct proportionality to the distance
C. The square of the distance
D. The cube of the distance
Answer: Inverse proportionality to the distance
The term ‘magnetic field’ refers to:
A. The region around a magnet where magnetic forces act
B. The region where electric forces act
C. The area inside a coil of wire
D. The space around a charged particle
Answer: The region around a magnet where magnetic forces act
The direction of the induced current in a conductor moving through a magnetic field is given by:
A. Fleming's Right-Hand Rule
B. Fleming's Left-Hand Rule
C. Lenz's Law
D. Faraday's Law
Answer: Fleming's Right-Hand Rule
The self-inductance of a coil depends on all of the following except:
A. The number of turns of the coil
B. The core material
C. The length of the coil
D. The applied voltage
Answer: The applied voltage
The magnetic field strength inside a solenoid is given by the formula:
A. B = μ₀nI
B. B = μ₀I/n
C. B = μ₀nI²
D. B = μ₀I/n²
Answer: B = μ₀nI
The magnetic field at the center of a current-carrying circular loop is directly proportional to:
A. The current and the radius of the loop
B. The current and the number of turns of the loop
C. The magnetic field strength
D. The diameter of the loop
Answer: The current and the number of turns of the loop