Magnetism and Electromagnetic Induction MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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The direction of the magnetic field inside a bar magnet is from:
A. South pole to North pole
B. North pole to South pole
C. East pole to West pole
D. West pole to East pole
Answer: North pole to South pole
The magnetic flux through a surface is defined as:
A. The product of the magnetic field and the area through which it passes
B. The product of the current and resistance
C. The rate of change of magnetic field
D. The product of the voltage and current
Answer: The product of the magnetic field and the area through which it passes
A device used to measure the strength of the magnetic field in a material is called a:
A. Magnetometer
B. Voltmeter
C. Galvanometer
D. Barometer
Answer: Magnetometer
The direction of induced EMF in a coil due to a changing magnetic field is given by:
A. Lenz's law
B. Faraday's law
C. Ampere's law
D. Biot-Savart law
Answer: Lenz's law
The magnetic field lines around a current-carrying wire are:
A. Concentric circles
B. Parallel lines
C. Radial lines
D. Spiral lines
Answer: Concentric circles
In a magnetic field, the direction of the force on a positive charge moving perpendicular to the field is given by:
A. Right-hand rule
B. Left-hand rule
C. Ampere's law
D. Fleming's left-hand rule
Answer: Right-hand rule
The unit of magnetic flux density is:
A. Tesla
B. Newton per meter
C. Joule per Coulomb
D. Watt per square meter
Answer: Tesla
The phenomenon where an electric current is induced in a conductor by a changing magnetic field is known as:
A. Electromagnetic induction
B. Magnetic polarization
C. Electrostatic induction
D. Magnetic resonance
Answer: Electromagnetic induction
The magnetic field due to a current-carrying solenoid can be increased by:
A. Increasing the current
B. Decreasing the number of turns
C. Using a thicker wire
D. Decreasing the length
Answer: Increasing the current