Question

An artificial satellite is in circular orbit around the earth. One of the rockets of the satellite is momentarily fired, the direction of firing of rocket is mentioned in Column I and corresponding change(s) are given in Column II. Match the entries of Column I with the entries of Column II.

Answer 1

$A\to 1,3$

At the centre of this spherical shell $E=0$ due to equal magnitude of electric field from all sides and $V\ne 0$ as energy requires to assemble the shell is $\ne 0$ .

$B\to 1,4$

$E=0$ because charge enclosed is zero. $V=0$ since potential is directly proportional to $V$ .

$C\to 2,3$

At the cavity $E\ne 0$ due to lack of symmetry for force to balance and become zero. $V\ne 0$ has energy required to assemble the sphere will not be equal to zero.

$D\to 1,3$

$E=0$ as due to symmetry $E$ from both th chrge will cancel each other. $V\ne 0$ as energy required to bring the both charge will not be equal to zero.