Free Electromagnetism MCQs with Answers

• A. Gauss
• B. Weber
• C. Henry
• D. Tesla

Explanation: Volt × second/ampere is equivalent to Weber (Wb), which is the SI unit of magnetic flux.

• A. Restoring torque
• B. Deflection torque
• C. Back EMF torque
• D. None of these

Explanation: The torque produced in the moving coil of a generator is typically referred to as electromagnetic torque or simply generator torque.

• A. Proton
• B. Electron
• C. Both will suffer greater deflection
• D. None

Explanation: Due to its smaller mass and the same charge-to-mass ratio as the proton, the electron will experience a greater deflection when projected…

• A. DC voltage
• B. AC voltage
• C. None of these
• D. Both a and b

Explanation: Transformers works on the principal of induction, with DC voltage current cannot be secondary coil.

• A. TV
• B. Radio
• C. Transformer
• D. Telephone

Explanation: Electromagnetic induction is the phenomenon where a changing magnetic field induces an electromotive force (EMF) in a conductor.

• A. Slip rings
• B. Split rings
• C. Stopper
• D. Cannot be converted

Explanation: AC Generator: An AC generator uses slip rings to connect the rotating armature to the external circuit.

• A. Area of coil is changed
• B. Magnet which was placed at a distance is moved closer to it.
• C. Coil is rotated
• D. All of these

Explanation: Faraday's law of electromagnetic induction states that an electromotive force (EMF) is induced in a conductor when the magnetic flux…

• A. Spring constant
• B. Electric force
• C. Magnetic force
• D. Gravitational constant
• E. All of these

Explanation: A torsion balance is a sensitive instrument used to measure weak forces.

• A. i is true
• B. ii is true
• C. Both a and b
• D. None of these

Explanation: Toroid: A toroid is a coil of wire wound in the shape of a donut or ring.

• A. V
• B. B
• C. L
• D. All of these

Explanation: Faraday's law of electromagnetic induction states that the magnitude of the induced electromotive force (EMF) in a conductor is directly…

• A. 100 times
• B. 1000 times
• C. 10000 times
• D. Remains same

Explanation: The energy stored in an inductor is given by:U = (1/2) * L * I^2where:U is the energy storedL is the inductance of the inductorI is the…

• A. 10 J
• B. 100 J
• C. 200 J
• D. 50 J

Explanation: Okay, now that we know the inductance (L = 2 H), we can calculate the energy stored.Using the formula:CopyU = (1/2) * L * I^2We have:CopyU…

• A. emf
• B. Current
• C. Changing magnetic field
• D. None of these

Explanation: A changing electric field produces a changing magnetic field. This is one of the fundamental principles of electromagnetism, described by…

• A. B/2
• B. B/4
• C. 2B
• D. B/3

Explanation: The magnetic field inside a solenoid is given by: B = μ₀ * n * Iwhere:B is the magnetic fieldμ₀ is the permeability of free spacen is the…

• A. Voltage from the heart
• B. Heartbeat
• C. Stress
• D. None of these

Explanation: An electrocardiogram (ECG or EKG) is a test that measures the electrical activity of the heart.

• A. Heart
• B. Brain
• C. Both a and b
• D. None of the above

Explanation: An electroencephalogram (EEG) is a test that measures the electrical activity of the brain.

• A. Magnetometer
• B. Voltmeter
• C. Wilson-cloud chamber
• D. None of the above

Explanation: A magnetometer is a device that measures the strength and direction of a magnetic field.

• A. Filament
• B. Cathode
• C. Anode
• D. Electron Gun

Explanation: In a Cathode Ray Oscilloscope (CRO), electrons are emitted from the cathode.

• A. Anode
• B. Cathode
• C. Grid
• D. Filament

Explanation: The brightness of the spot on the screen of a Cathode Ray Oscilloscope (CRO) is controlled by the grid which is a negatively charged…

• A. Electric
• B. Magnetic
• C. Both a and b
• D. None of these

Explanation: A moving charge produces both an electric field and a magnetic field. This is a fundamental principle of electromagnetism.Electric Field…