| ASSERTION: A metallic shield in the form of a hollow shell can be built to block an elastic field. |
| REASON: In a hollow spherical shell, the electric field inside is zero at every point. |
A) If both assertion and reason are true and reason is the correct explanation of assertion.
B) If both assertion and reason are true and reason is not the correct explanation of assertion.
C) If assertion is true but reason is false.
D) If both assertion and reason are false.
E) If assertion is false but reason is true.
Correct Answer: A
Solution :
According to principle of electrostatic shielding, the electric field inside a hollow conductor is zero. Therefore if an object located inside a hollow conductor is subjected to electric field, there will be no effect of electric field on the object. In other words, the hollow conductor shields the Object from external electric field. This concept is made use of to shield the wires carrying audio signals (low frequency signal) from the external electric fields, such as due to atmospheric electricity or due to electric sparks. If such wires are not shielded, the audio signals will give rise to a noisy sound on reproduction.
You need to login to perform this action.
You will be redirected in
3 sec
