Electric Charges and Fields — Physics STD 12 Science — Question

Assertion  :   When the speed of an electron increases its specific charge decreases.
Reason      : Specific charge is the ratio of the charge to mass.(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.

The intensity of magnetic field is H and moment of magnet is M. The maximum potential energy is(a) MH(b) 2 MH(c) 3 MH (d) 4 MH

Coherent sources of light produce constructive interference while there is a phase difference between them is :

Assertion   :   A metallic shield in form of a hollow shell may be built to block an electric field.
Reason       : In a hollow spherical shield, the electric field inside it is zero at every point. (a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.

From a point charge, there is a fixed point A. At A, there is an electric field of 500V/ m and potential difference of 3000V. Distance between point charge and A will be:

Isotopes of an element contain:

The magnetic susceptibility is negative for(a) Paramagnetic materials(b) Diamagnetic materials(c) Ferromagnetic materials(d) Paramagnetic and ferromagnetic materials