Assertion (A): In a common source amplifier with source terminal at ac ground the voltage gain is about g_m r_d

Reason (R): A common source amplifier is a source follower circuit

Assertion (A): Ionic solids, in general, have no electrical conductivity.

Reason (R): In ionic solids, electrons are tightly bound to the nucleus.

Assertion (A): The optical dielectric constant (i.e., ε_r at optical frequencies)of ionic dielectrics is less than static dielectric constant.

Reason (R): At optical frequencies, P_i = 0.

1. Impedance of Gunn diode is about tens of ohms.
2. Impedance of Impatt diode is a few ohms.
3. Impedance of Impatt diode are of the same order.
4. Impedance of Impatt diode is more than that of Gunn diode.

1. It can have alphabets, digits or underscores but no other special character.
2. The maximum number of characters is 8.
3. The first character may be an alphabet or digit but not underscore.

Assertion (A): Positive feedback is not used in any circuit.

Reason (R): Positive feedback leads to instability.