Question

Electrons are emitted by a hot filament and are accelerated by an electric field as shown in figure. The two stops at the left ensure that the electron beam has a uniform cross-section. Match the entries of column-I with column-II as electron move from $A$ to $B$

Answer 1

A:
Speed of electron will increase as it travels from A to B since work done on it will be positive.
B:
No of free electrons per unit volume of the filament will decrease since the no of electrons decrease.
C:
Current density remains same since the rate of emission of electrons remains same over time.
D:
Electric potential of the filament increases since it becomes positively charged.