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Solution


Q.

If a person has five resistors each of value 15Ω then the maximum resistance he can obtain by connecting them is:
1 1 Ω  
2 5 Ω  
3 10 Ω  
4 25 Ω  

Ans.

(1)

Resistance of one resistor = 15Ω

Number of resistors = 5

Maximum resistance can be obtained by combining the resistors in series: 

Rs=R1+R2+R3+R4+R5=15+15+15+15+15=1+1+1+1+15=55=1Ω

Hence, a person on combining five resistors in series gets resistance  1 Ω