QUESTION 7 Magnetic lines that are close to each other are said to have a high O

Question

QUESTION 7 Magnetic lines that are close to each other are said to have a high O reluctance O inductance O flux density O current QUESTION 8 Magnetic flux is another name for a magnetic field True O False O Question Completion Status QUESTION 9 is a type of electrornagnetic device that has a movable iron core called O analog meter O relay O speaker O solenoid QUESTION 10 than an air core electromagnet. An iron core electromagnet has a higher O current O permeability O resistance O reactance QUESTION 11 How will two permanent bar magnets react if they are brought close to each other? O They will repel if the north and south poles are together. O They will attract if their south poles are together. O They will attract if the north and south poles are together. O They will attract if their north poles are together. QUESTION 12 The principal difference between a solenoid and a relay is that: O relays relay electricity, solenoids do not. O solenoids do mechanical work, relays do electrical work

Explanation / Answer

Question 7)

Magnetic lines that are close to each other are said to have high flux density.

Flux density = The amount of magnetic flux passing through a unit area

Question 8)

False

Because the magnetic flux passing through a surface is the surface integral of normal component of the magnetic field passing through that surface.

Both are not the same.

Question 9)

Solenoid

Solenoid is inductive coil, wound around a movable steel or iron plunger

Question 10)

Permeability

High permeability means high flux lines are easily created and pass through the central core. Permeability is a measure of how ease the core can be magnetized.

Permeability ratio of iron to air is about 500.

Question 11)

They will attract if the their north and south poles are together

North pole attracts south pole and vice versa. North pole repels north pole and south pole repels south pole.

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.