A potential difference is applied across (i) an issulator at 0 k (ii) a semiconductor at 0 k (iii) a metal at 0 k (iv) a reverse biased p-n junction diode at 300 k then the current passing through

Options

A. is zero
B. is zero
C. is inlfinite
D. is finite

Explanation

To solve the problem, we will analyze the current passing through each of the four scenarios described: an insulator at 0 K, a semiconductor at 0 K, a metal at 0 K, and a reverse-biased p-n junction diode at 300 K.

### Step-by-Step Solution:

1. **Insulator at 0 K:**
- Insulators have a very high resistance and do not allow current to flow through them. At absolute zero (0 K), the thermal energy is insufficient to promote any charge carriers across the energy gap.
- **Conclusion:** The current passing through an insulator at 0 K is **0 A**.

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