IB_Chapter-5

Apply junction law to point A or point B and which relationship among currents is given true?

• i₁ + i₂ = i₃

• i₂ + i₃= i₁

• i₃ + i₁= i₂

In the circuit below, n charge carriers pass the point P in a time t. Each charge carrier has charge q.

The current in the circuit is given by the expression

• q/t

• n.q/t

• q.t/n

• n.q.t

A wire is made of a metal of resistivty g. Thewire has length L and radius r and resistance R. What will be the resistance of another wire of resistivity 2g, length L/2 and radius 2r?

• R

• R/2

• 2R

• R/4

Determine the total resistance of the circuit, R_total

• 2.4

• 4.0

• 5.4

• 6

• 7.4

In the figure above, the current through the 4.0-ohm resistor is 3.0 A.

Determine the potential difference between a-b, V_ab .

• 12

• 18

• 24

• 37