Question

(1
(iii) The ratio of magnitude of drift velocity (a) to the applied electric field (E) is called
mobility (u) i.e. u = lval
. Which is not true about mobility?
(a) Mobility is always positive
(b) Mobility may be negative also
(c)
SI unit of inobility is m/Vs
(d) SL of mobility is mC/Ns
Here, m--meter, s-second, V-vit, C-couimb, ​

Answer 1

Answer:

mobility is always positive

Answer 2

Answer:

Option a and c are correct.

Explanation:

Mobility is defined as the magnitude of the drift velocity per unit electric field.

Mobility is denoted by the symbol $\mu$.

The formula of mobility is given by, $\mu = \frac{v_d}{E}$

where, $v_d$ is the magnitude of the drift velocity of the electron,

and $E$ is the magnitude of the electric field.

Mobility of charge is always positive for positive charges as well as negative charges. Therefore, option (a) is correct.

Unit of the electric field is volt per meter i.e. $V/m$.

Unit of velocity is meter per second i.e. $m/s$

Therefore, units of mobility is, $\frac{m/s}{V/m}=m^2 /Vs$

#SPJ2