When resistors are connected in parallel, more current flows from the source than would flow for any of them individually, so the total resistance is lower. Each resistor in parallel has the same full voltage of the source applied to it, but divide the total current amongst them.

When resistors are connected in parallel the effective resistance?

The effective resistance in parallel combination of two equal resistance is 'p'. Here, the reciprocal of equivalent resistance is the sum of reciprocals of individual resistances 'R'. So, the correct answer is “Option 1”.

When number of resistance are connected in parallel the total resistance is?

When a number of resistances are connected in parallel then combined resistance is less than the smallest individual resistance.