A negative charged particle is released from rest in a uniform electric field. The electric potential energy of charge
Remains constant because of uniform electric field
Increases because charge moves opposite to electric field
Decreases because charge moves against electric field
Decreases because charge will move along electric field
A charge $Q$ is placed at each of the opposite corners of a square. A charge $q$ is placed at each of the other two corners. If the electrical force on $Q$ is zero, then $Q/q$ equals
If potential at centre of uniformaly charged ring is $V_0$ then electric field at its centre will be (assume radius $=R$)
In a parallel plate air capacitor, a cathode beam comprising $n = 10^6$ electrons is emitted with a velocity $v_0 = 10^8\ m/s$ into the space between the plates. The potential difference between the plate is $\phi = 400\ V$ ,the seperation between the plates is $d = 2\ cm$ and the area of each plate is $l^2 = 100\ cm^2$ . The deflection of the electron beam, is ........... $mm$
Two identical charged spherical drops each of capacitance $C$ merge to form a single drop. The resultant capacitance
Force between $A$ and $B$ is $F$. If $75\%$ charge of $A$ is transferred to $B$ then force between $A$ and $B$ is