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The B/H characteristics can be determined using _______
Ammeter
Fluxmeter
Voltmeter
Multimeter
Fluxmeter
The B/H characteristic (or magnetization curve) of a magnetic material describes the relationship between the magnetic flux density (B) and the magnetic field strength (H) ┬╖ A fluxmeter is specifically designed to measure the change in magnetic flux linkage in a search coil, making it the standard instrument for plotting the hysteresis loop.
The B/H characteristic (or magnetization curve) of a magnetic material describes the relationship between the magnetic flux density (B) and the magnetic field strength (H) ┬╖ A fluxmeter is specifically designed to measure the change in magnetic flux linkage in a search coil, making it the standard instrument for plotting the hysteresis loop.
B=A╬жтАЛ тАФ Magnetic flux density (Wb/m2)
H=lNIтАЛ тАФ Magnetic field strength (AT/m)
╬ж=тИлedt тАФ Flux measurement principle
The fluxmeter acts as a ballistic galvanometer with negligible control torque ┬╖ When the magnetic field strength H in a specimen is varied, the induced EMF in a search coil wound around the specimen causes a current to flow ┬╖ The fluxmeter integrates this current, and its deflection is directly proportional to the total change in flux ╬ж passing through the coil, allowing for the mapping of B vs H.
A fluxmeter is an integrating device used to measure magnetic flux change.
Unlike a ballistic galvanometer, a fluxmeter does not require a correction for the period of oscillation.
The B/H curve displays non-linear behavior due to magnetic saturation.
The area of the B-H loop represents energy loss per cycle (hysteresis loss).
High accuracy for flux measurement
Independent of the time taken for flux change
Requires careful calibration
Sensitive to mechanical vibrations
Testing of transformer core materials
Determination of permanent magnet properties
Quality control in metallurgical magnetic alloys
Option A (Ammeter) measures current, not flux ┬╖ Option C (Voltmeter) measures potential difference ┬╖ Option D (Multimeter) is a general-purpose tool and lacks the specialized integration capability for plotting full B-H loops.
B is correct тАФ A fluxmeter is used to measure magnetic flux and is the essential instrument for plotting B-H characteristics.
Remember that a fluxmeter is essentially an integrating instrument; any question involving 'total flux change' usually points toward the use of a fluxmeter.