pls answer with explanation thank you.. 1.If a 75 W bulb and a 100 W bulb are co
ID: 1950716 • Letter: P
Question
pls answer with explanation thank you..1.If a 75 W bulb and a 100 W bulb are connected in series across a 120 V outlet, the 75 W bulb will dissipate 75 W of power and the 100 W bulb will dissipate 100 W of power.
2.The potential across the terminals of a store-bought 1.5 V AAA battery always remains at 1.5 V unless the battery has gone dead.
3.If a magnetic compass is placed between the plates of a fully charged capacitor, the compass will align itself along the electric field lines.
4.A compass is placed close to a stationary charge. If the charge remains stationary, the compass will not deflect, but if the charge moves, the compass will deflect.
5.Two long, current-carrying wires run parallel to each other. If these wires tend to push away from each other, the currents in them must be in opposite directions.
6.The net magnetic field inside a conductor must be zero.
7.A small plastic ball has an excess negative charge on it. If a magnet is placed close to this ball, it will either attract or repel the ball, depending upon which pole is closer to the ball.
Explanation / Answer
1.If a 75 W bulb and a 100 W bulb are connected in series across a 120 V outlet, the 75 W bulb will dissipate 75 W of power and the 100 W bulb will dissipate 100 W of power.
FALSE
resistance across 75= 120^2 / 75 = 192
resistance across 100= 120^2 / 100 = 144
total resistance = 192+144 = 336
current = 120 / 336 = 0.357 A
voltage across 75W = 192*0.357 = 68.544
voltage across 100W = 144*0.357 = 51.408
power across 75W = 68.544 * 0.357 = 24W
power across 75W = 51.408 * 0.357 = 17.928 W
thus ans
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