When two flat plate conductors are arranged in such a way that they posses equal and opposite charges separated by a dielectric, the form a/an

Which of the following radiations has the longest wavelength

 A resistor with fixed resistance value is called a 

A person touching the appliances is safe from electric shock

Both the a.c. and the d.c. sources can be used 

The appliances are maintained at a higher p.d. than the earth 

The appliances are maintained at a lower p.d. than the earth

Electrical  appliances in homes are normally earthed so that 

Physics