A Proton Beam That Carries a Total Current of 1

question 13

Multiple Choice

A proton beam that carries a total current of 1.3 mA has 10.0 mm diameter. The current density in the proton beam increases linearly with distance from the center. This is expressed mathematically as J(r) = J₀ (r/R) , where R is the radius of the beam and J₀ is the current density at the edge. Determine the value of J₀.

• A) 25 A/
• B) 6.2 A/
• C) 12 A/
• D) 17 A/

---

Definitions:

Tardive Dyskinesia

A neurological disorder characterized by involuntary, repetitive body movements, often resulting from long-term use of antipsychotic medication.

Dopamine Receptor Sites

Specific locations on nerve cells in the brain that interact with dopamine to transmit signals related to pleasure, reward, and motor function.

Long-term Use

Refers to the extended duration of applying or engaging with a substance, tool, or practice.

Antipsychotic Drugs

Medications used to treat psychotic symptoms such as delusions, hallucinations, and disorders like schizophrenia.