PartA A thin, 48.0 cm long metal bar with mass 750 g rests on but is not attache

Question

PartA A thin, 48.0 cm long metal bar with mass 750 g rests on but is not attached to, two metallic supports in a uniform magnetic field with a magnitude of 0.480 T, as shown in the figure (Figure 1). A battery and a resistor of resistance 28.0 ? are connected in series to the supports What is the largest voltage the battery can have without breaking the circuit at the supports? Submit Request Answer Part B The battery voltage has the maximum value calculated in part (a). If the resistor suddenly gets partially short-circuited, decreasing its resistance to 2.40 S2, find the initial acceleration of the bar n/s Figure 1 of 1 Submit Request Answer Provide Feedback Next> ?????

Explanation / Answer

By balancing the forces on mmetal bar

magnetic force = gravitational force

BiL = mg

i = 0.75*9.8 / 0.48*0.48

i = 31.9 A

Largest volatge, V = iR

V = 31.9*28

V = 893.22 V

(b)

Now resistance R' = 2.4 ohm

current, i' = V / R'

i' = 893.22 / 2.4 = 372.17 A

Let, acceleration on the bar = a

Bi'L - mg = ma

a = [(0.48 * 372.17 * 0.48) - (0.75 * 9.8)] / 0.75

a = 104.53 m/s^2

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