The resistance of the rheostat shown in figure is 30 Ω Ω . Neglecting the ammeter resistance, the ratio of minimum and maximum currents through the ammeter, as the rheostat is varied, will be
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
For I max , R h is minimum which is zero.
I max = 
Amp.
for I min , R h is maximum which is 30 Ω Ω .
I min = 
Amp.
= 
Amp
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