Electric Charges and Fields
ICSE · Class 12 · Physics
Flashcards for Electric Charges and Fields — ICSE Class 12 Physics. Quick Q&A cards covering key concepts, definitions, and formulas.
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See them allState the law of interaction between electric charges.
Answer
Like charges repel each other while unlike charges attract each other.
Why is repulsion the real test of charge on a body?
Answer
Attraction can occur even between a charged body and an uncharged body due to induction. Repulsion happens only when both bodies are charged with like charge, so it is the definite test.
State the definition of a conductor and give examples.
Answer
Conductors are substances through which electric charge can easily flow. Metals, human body, earth, mercury, and electrolytes are conductors.
State the definition of an insulator and give examples.
Answer
Insulators are substances in which electric charge cannot flow easily. Glass, hard rubber, plastics, and dry wood are insulators.
What is electric charge in terms of electrons in a body?
Answer
If a body has an excess of electrons, it becomes negatively charged. If it has a deficiency of electrons, it becomes positively charged. Only electrons are transferred in ordinary electrification.
How many electrons correspond to a charge of 3.2 × 10^-19 C?
Answer
Given charge, q = 3.2 × 10^-19 C Elementary charge, e = 1.6 × 10^-19 C Formula: n = q / e Step 1: n = (3.2 × 10^-19 C) / (1.6 × 10^-19 C) Step 2: n = 2 Answer: 2 electrons…
State the law of conservation of charge.
Answer
The total amount of charge in an isolated system remains constant.
What is the charge of an electron, proton, and alpha particle?
Answer
Electron: -e Proton: +e Alpha particle: +2e where e = 1.6 × 10^-19 C.
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