Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : The outer body of an air craft is made of metal which protects persons sitting inside from lightning-strikes.
Reason (R) : The electric field inside the cavity enclosed by a conductor is zero.
In the light of the above statements, chose the most appropriate answer from the options given below :
Assertion (A) : The outer body of an air craft is made of metal which protects persons sitting inside from lightning-strikes.
Reason (R) : The electric field inside the cavity enclosed by a conductor is zero.
In the light of the above statements, chose the most appropriate answer from the options given below :
- (A)Both (A) and (R) are correct and (R) is the correct explanation of (A)✓ Correct
- (B)(A) is correct but (R) is not correct
- (C)Both (A) and (R) are correct but (R) is not correct explanation of (A)
- (D)(A) is not correct but (R) is correct
Answer: (A)
Solution
The metal skin of an aircraft behaves as a closed conductor, and the electric field within the cavity it encloses is zero when no charge sits inside. A lightning strike deposits charge only on the outer surface, leaving the interior field zero, so the occupants are shielded. Both statements are correct, and the vanishing field inside the enclosed cavity is exactly why the metal body protects the passengers, so the reason correctly explains the assertion.
JEE Main · 2025 · 07 Apr 2025 · Shift 2 · Single correct option