how will you make a tester using a magnetic field of current
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If you want to measure AC current, then look no further than a normal clamp-on ammeter. This is essentially a current transformer, where the conductor under test forms a single-turn primary.
A normal AC ammeter will also be needed to display the secondary current, and needs to be suitably scaled by the turns ratio,
This form of ammeter is useful to measure the current in a running circuit, without having to open the circuit to insert an instrument.
Voltage and resistance CANNOT be measured by means of the circuit’s magnetic field.
Looking at the question in another way, nearly all analogue meter instruments use the magnetic field formed by the current flowing through the meter to cause the meter’s needle to deflect.
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A normal AC ammeter will also be needed to display the secondary current, and needs to be suitably scaled by the turns ratio,
This form of ammeter is useful to measure the current in a running circuit, without having to open the circuit to insert an instrument.
Voltage and resistance CANNOT be measured by means of the circuit’s magnetic field.
Looking at the question in another way, nearly all analogue meter instruments use the magnetic field formed by the current flowing through the meter to cause the meter’s needle to deflect.
ల
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