1. The dimensional formula of angular momentum is

2. The dimensional formula of torque is

3. The unit of relative permittivity is

4. Planck's constant has the dimension of

5. The strength of electric repulsion between electrons is larger than the gravitational attraction between them by an order of

6. Which of the following have same dimension?

7. The unit of ∈_{0}, the absolute permittivity of free space is

8. "Light year" is the unit of