1. A circuit consists of two resistors with resistances R1 = 6 ohm and R2 = 1.5

Question

1. A circuit consists of two resistors with resistances R1 = 6 ohm and R2 = 1.5 ohm, a variable resistor, the resistance Rvar of which can be adjusted, a resistor of unknown value Rw, and 9 0 volt battery connected as shown in the figure. When Rvar adjusted to 12ohm there is zero current through the ammeter What is the unknown resistance Rw. 2. We connect a single circular loop to a power supply that pump 0.2A to the loop After measuring the value of Magnetic field (B) the value was 12.6 T What was the radius of our loop? (Mu0 = 1.26 X 10^-6 Tm/A)

Explanation / Answer

It is a wheatstone bridge circuit R1/Rvar = R2/Ru when A=0 => 6 /12 = 1.5/Ru => Ru= 3 ohms

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