A 3.0-V flashlight bulb is connected to a square loop of wire that measures 60 cm on a side as shown in Figure P21.62. Assume the bulb will only light if the potential across its terminals is at least 3.0 V. The loop is oriented perpendicular to a uniform magnetic field of 2.5 T. The magnetic field then decreases to zero over a period of time Δt such that the bulb is just barely lit. 

(a) Find how long the bulb will light at full output.
(b) In which direction will the current flow around the loop?

 

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