Assertion (A): The equation D = ∈₀∈_rE is applicable only to isotropic materials.

Reason (R): In polycrystalline materials, the directional effects are absent.

1. A 33 MHz 486 has higher MIPS than 33 MHz 386.
2. A 33 MHz 486 has higher MFLOPS than 33 MHz 386 of these statements.

Assertion (A): When cathode temperature is increased from 2500 K to 2550 K, thermionic emission current may increase by about 50%.

Reason (R): Thermionic emission current ∝ T² e^-Ew/kT.

1. Current in the circuit is in phase with applied voltage
2. Voltage drop across capacitor C and inductance L are equal in magnitude.
3. Voltage across the capacitor is equal in magnitude to the applied voltage.
4. Current in the circuit is maximum.

Assertion (A): Negative values of incremental operator in DO loop are allowed in Fortran 77 but not in earlier versions of Fortran.

Reason (R): Fortran 77 has better array facilities than earlier versions of Fortran.