Solenoids and Electromagnets (pages 637-638)
7. Is the following sentence true or false? The strength of the
magnetic field through the center of a coil of current-carrying wire
is calculated by adding together the fields from each turn of the
coil.
8. A coil of current-carrying wire that produces a magnetic field is
called a(n)
9. What is an electromagnet?

Question

UpStudy AI · Accepted Answer

1. **Question 7:**  
   A coil of current-carrying wire produces a magnetic field where each turn contributes its own field. Due to the principle of superposition, the total magnetic field through the center of the coil is the sum of the fields produced by each individual loop. Mathematically, if each loop produces a field $$ B_{\text{loop}} $$ at the center, then for $$ N $$ loops the total field is  
   $$
   B_{\text{total}} = N \times B_{\text{loop}}
   $$
   Therefore, the sentence is **true**.

2. **Question 8:**  
   A coil of current-carrying wire that produces a magnetic field is called an **electromagnet**.

3. **Question 9:**  
   An **electromagnet** is a device in which a magnetic field is generated by the flow of electric current. Typically, it consists of a coil of wire (and often a ferromagnetic core) so that when current flows through the coil, the individual magnetic fields produced by each loop add together to create a strong overall magnetic field. When the current is switched off, the magnetic field disappears.
1. **Question 7:** The sentence is **true** because the total magnetic field at the center of a coil is the sum of the fields from each turn. 2. **Question 8:** A coil of current-carrying wire that produces a magnetic field is called an **electromagnet**. 3. **Question 9:** An **electromagnet** is a device that creates a magnetic field when electric current flows through a coil of wire.

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