True and False: 4 Points Each Any answers NOT recorded on the Scantron answer pa

Question

True and False: 4 Points Each Any answers NOT recorded on the Scantron answer page will NOT be counted 1. Like magnetic poles repel each other and opposite magnetic atract poles each othen A) True B) False 2. The magnetic pole in the southern hemisphere of the Earth is a "South" magnetic pole. A) True B) False A charged particle that has a velocity in a direction that is parallel to a magnetic field will experience no net magnetic force. 3. A) True B False 4. In a series RC circuit, if the circuit is open and the capacitor is uncharged, then the instant just after t switch is closed the voltage drop across the capacitor is equal in magnitude to power supply voltage A) True "An induced emf gives rise to a current whose magnetic field opposes the change in magnetic flux ? B) False 5. produced it" is a statement of Lenz's Law. A) True B) False 6. A transformer that steps down the voltage also steps up the current A) True B) False 7. The typical line voltage in the United State has an rms value of 170 V. A) True B) False 8. The strength of the magnetic field through a solenoid can be determined from B HoNIL A) True B) False

Explanation / Answer

17.

Remember:
For series combination
Req = R1 + R2 + R3 +...............
for parallel combination
1/Req = 1/R1 + 1/R2 + 1/R3 + ............
for 2 resistors in parallel it will be
Req = R1*R2/(R1+R2)
Using this Information:

R3 and R2 are in parallel,So

Rp = 4*12/(4 + 12) = 3 ohm

Now Rp and R1 are in series, So

Req = 5 + 3 = 8 ohm

Correct option is E.

18.

Using ohm's law:

V = i*Req

i = 24/8 = 3 Amp

Now remember in resistors parallel combination voltage distribution in each part will be same and in series combination current distribution in each resistor will be same.

Current in R3 = current in Rp = i = 3 Amp

Correct option is F.

19.

V1 = i1*R1

V1 = 3*5 = 15 V

Correct option is E.

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