KCET2021PhysicsCurrent Electricity
Consider an electrical conductor connected across a potential difference V . Let q be a small charge moving through it in time t . If I is the electric current through it, I. the kinetic energy of the charge increases by I V t . II. the electric potential energy of the charge decreases by I V t . III. the thermal energy of the conductor increases by IV t . Choose the correct option.
Options
- AOnly I
- BI and II
- CI and III
- DII and III
Correct answer
D. II and III
Step-by-step solution
As the charges flow from higher potential to lower potential. So, its potential energy decreases by I V t but kinetic energy increase. This increase in energy is transferred to conductor which increases the thermal energy by I V t . So, statements (II) and (III) are correct.