9) The fi gure shows two long wires carrying equal currents Ii out of the page a

Question

9) The fi gure shows two long wires carrying equal currents Ii out of the page and ls flowing into the page. Which of the arrows labeled A correctly represents the direction of the magnetic field due D to both wires at a point located at an equal distance d from each wire? A) A ?) ? C) C D) D E) The magnetic field is zero at that point. 12 10) A light bulb is connected in the circuit shown in the figure with the capacitor initially uncharged. Which one of the following graphs best describes the brightness B of the bulb as a function of time t after closing the switch S? A) B) C) D) E)

Explanation / Answer

9) at the point

as the direction of magnetic field due to both is perpendicular to the line joining the point and the current

the horizontal components of field will cancel out

and the net magnetic field will be upwards

hence , the correct option is C)

10)

as the potential across the capacitor is given as

V = Vo * (1 - e^(-t/T))

hence, the potential across the bulb will also be this

and hence , the correct option for brightness is D)

the correct option is D)

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