2. The figure shows a current- versus-potential-difference graph for an object.

Question

2. The figure shows a current- versus-potential-difference graph for an object. What is the object's resistance? Current vs. Potential Difference 1.5 A) 0.02 ? 0.5 C) 10 2 50 ? ) 100 ? 0 25 50 75 100 AV(V) 3. Shown is an arrangement of wires with electric current running through them, as marked. Each wire is made from the same material and has the same diameter. The length of the wires is according to the square grids in the background. What is the correct ranking of the currents? A) 11 12 13 14 Page 3 of 12

Explanation / Answer

2.

according to ohm's law

R = V/i

so i /V = 1/R

slope of the current vs Voltage graph gives the value of "1/R"

hence slope = 2/100

1/R = 2/100

R = 50 ohm

3.

E

using conservation of charge , charge entering = charge going out

hence I1 = I4

since the resistance of the side of the rectangular loop is equal , the current I1 divides equally into I2 and I3

hence  I2 = I3

so correct choice is E

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