The charge on an electron is :

1. +1.6 x 10^-19 C
2. -1.6 x 10^-20 C
3. +1.6 x 10²⁰ C
4. -1.6 x 10^-19 C

The number of electrons in 1 C charge is :

1. 6.25 x 10¹⁸
2. 6.25 x 10¹⁹
3. 6.25 x 10²⁵
4. 1.6 x 10^-19

If n electrons pass through a cross-section of a conductor in time t, then current in conductor is :

1. I = $\dfrac{ne}{t}$
2. I = $net$
3. I = $\dfrac{nt}{e}$
4. I = $\dfrac{n}{et}$

If W joule of work is done in bringing a test charge Q coulomb from infinity to the point P, then electric potential V at point P is :

1. V = WQ
2. V = Q/W
3. V = W/Q
4. none of the above