The resistor in which maximum heat will be produced is

a)

2

b)

3

c)

4

d)

6

(c)

Here, 2 , 3  and 6  are in parallel. So potential drop across them will be the same. As heat produced, , so maximum heat will be generated across 2  resistance. Similarly 4  and  are also in parallel, so more heat will e generated across 4 . Now the effective circuit will become

Total resistance,

Current,

and

Power spent across 2 ,

Power spent across 4  ,

. Hence maximum heat is produced in 4  resistance.