Assertion (A): Gamma rays are fundamentally un-deflected by electric and magnetic fields. Reason (R): Gamma rays carry no electrical charge. MCQ with Answer and Explanation
Assertion (A): Gamma rays are fundamentally un-deflected by electric and magnetic fields. Reason (R): Gamma rays carry no electrical charge.
A. Both A and R are true but R is NOT the correct explanation of A.
B. Both A and R are true and R is the correct explanation of A.
C. A is false but R is true.
D. A is true but R is false.
Answer: Option B
Solution (By JKSSB Mock Tests)
Electric fields deflect charged particles via Coulomb forces (F=qE), and magnetic fields deflect moving charged particles via Lorentz forces (F=qvB). Gamma rays are purely high-energy electromagnetic photons. Because they lack any electrical charge (q=0), both electric and magnetic forces on them are exactly zero. Therefore, they pass through fields completely un-deflected. R explains A perfectly.
Explanation:
G = 6.67 × 10⁻¹¹ N m²/kg² in SI, and 6.67 × 10⁻⁸ dyne cm²/g² in CGS. Both are correct. Important constant, measured by Cavendish. g is acceleration due to gravity, different.
Explanation:
Michael Faraday discovered electromagnetic induction in 1831. He demonstrated that a changing magnetic field could induce an electric current in a nearby circuit. This groundbreaking discovery laid the foundation for all modern electric generators and transformers. Tesla contributed to AC systems, Edison to DC systems, and Hertz proved the existence of radio waves.
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