(a) Give one use of electromagnetic radiations obtained in nuclear disintegrations.
(b) Give one example each to illustrate the situation where there is (i) displacement current but no conduction current, and (ii) only conduction current but no displacement current.

Explanation

(a) Gamma-rays obtained in nuclear disintegration are used as radiations for treatment of cancer.
(b) When we consider a capacitor joined to an a.c. source then (i) between the plates of capacitor only displacement current is present but there is no conduction current, and (i) in the connecting wires only conduction current flows but there is no displacement current.