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WorksheetsAP-EM-Q2
Total questions: 10
Worksheet time: 5mins
An emf of 10 V is applied to a coil with an inductance of 40 mH and a resistance of 0.50 Ω.
Determine the energy stored in the magnetic field when the current reaches one half of its maximum value.
0.020 𝐽
0.20 𝐽
2.0 𝐽
20 𝐽
A solenoid is hooked up to a battery and a switch as shown below.At time 𝑡 = 0, the switch is closed. What is the current through the resistor immediately after the switch is closed?
0
𝑉/𝑅
𝑉/𝑅(1 − 𝑒-t/τ)
𝑉/𝑅(1 +𝑒-t/τ)
A parallel circuit is composed of a switch, a battery, an indicator and 2 resistors. Initially the switch is open, there is no current in the circuit and no energy in the inductor. Which statement is true about the initial current through this circuit immediately after the switch is closed?
There is no current through 𝑅2
There is no current through 𝑅1
There is no current through 𝐿.
There is current through 𝑅1, 𝑅2, 𝐿.
After the switch is closed for a long time, what is true regarding the currents through 𝑅1, 𝑅2 and 𝐿1?
𝐼R1 = 𝐼R2 and 𝐼L1 = 0
𝐼R1 = 𝐼L1 and 𝐼R2 = 0
𝐼R2 = 𝐼L1 and 𝐼R1 = 0
𝐼R1 > 𝐼R2 and 𝐼L1 = 0
14. A 10-turn ideal solenoid has an inductance of 3.5 mH. When the solenoid carries a current of 2.0 A the magnetic flux through each turn is:
0 Wb
3.5 x 10–4 Wb
7.0 x 10–4 Wb
7.0 x 10–3 Wb
Which of the following is not a unit for inductance?
Joule∙ second/Ampere
Weber/Ampere
Volt∙ second/Ampere
Joules/(Ampere)2
An inductance L and a resistance R are connected in series to an ideal battery. A switch in the circuit is closed at time t = 0, at which time the current is zero. The rate of increase of the energy stored in the inductor is a maximum:
just after the switch is closed
at the time t = L/R after the switch is closed
at the time t = 2L/R after the switch is closed
at the time t = (L/R)ln 2 after the switch is closed
In the circuit below, a fully charged capacitor with a capacitance C = 25 μF and charge Q = 4 μC is connected to an inductor L = 10 mH. What is the current in the circuit at the instant when the switch is closed
0 A
2 A
5 A
10 A
Which of the following occurs after the switch is closed?
The charge instantaneously vanishes
The charge exponentially decreases to zero
The charge stays unchanged
The charge oscillates with a period of π ms
Which of the below states that a changing electric flux through a closed loop or an electric current through the loop creates a magnetic field around the loop?
