Question #a46f3

1 Answer
Veerupaksh
Apr 23, 2017

(b) increase, is the correct answer.

Explanation:

Let the EMF of battery be #V_o#.
Power dissipated by the resistor is #V_o^2/R#.

Since the value of resistance is decreased. Let the new resistance be #R'#.
#therefore# power dissipated by the new resistor is #V_o^2/(R')#.

Now #R' < R#
#=> 1/(R') > 1/R#

#=> color(red)(V_o^2/(R') > V_o^2/R)#

#therefore# on decreasing the value of resistance, the power dissipated by resistor increases.

(b) increase, is the correct answer.

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