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Question

# In the circuit in figure, we have R2=20Ω , R3=15Ω, and the current flowing through resistor R2 is 0.3 A. The ammeter shows 0.8 A. Find the resistance R1 :20Ω30Ω40Ω60Ω

A
30Ω
B
60Ω
C
20Ω
D
40Ω
Solution
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#### Potential drop across R2 = Potential drop across R1 = Potential drop across R3Considering R2 and R3i2R2=i3R30.3×20=15×i3i3=0.4ACurrent passing through ammeter =i1+i2+i3=0.8i1+0.3+0.4=0.8i1=0.1APD across R1 should be equal to the potential drop across R2i1R1=i2R20.1R1=0.3×20R1=60ohmHence option D is correct.

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Q1
In the circuit in figure, we have R2=20Ω , R3=15Ω, and the current flowing through resistor R2 is 0.3 A. The ammeter shows 0.8 A. Find the resistance R1 :

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Q2

Resistors R1=10Ω, R2 = 40Ω, R3 = 30Ω, R4 = 20Ω, R5 = 60Ω and a 12V battery is connected as shown.

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Q3
If in figure R1=10Ω, R2=40Ω, R3=30Ω, R4=20Ω, R5=60Ω, and a 12 V battery is connected to the arrangement. Calculate (a) the total resistance in the circuit, and (b) the total current flowing in the circuit.

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