Physics

7 years ago

Describe paramagnetism

Northa 86 1 Reply

7 years ago

A 4.0 μF capacitor is connected in series with a 2.0 kΩ resistor across a 20-V DC source and an ...

A 4.0 μF capacitor is connected in series with a 2.0 kΩ resistor across a 20-V DC source and an open switch. If the switch is closed at t = 0 s, what is the charge on the capacitor at t = 9 ms?
A) 0 C
B) 37% of the minimum charge
C) 68

Brelou 85 1 Reply

7 years ago

A 8.0 μF capacitor is connected in series with a 6.0 kΩ resistor across a 20-V DC source and a ...

A 8.0 μF capacitor is connected in series with a 6.0 kΩ resistor across a 20-V DC source and a switch. What is the time constant of this RC circuit?
A) 9.0 ms
B) 12 ms
C) 40 ms
D) 18 ms
E) 48 ms

tankster 148 1 Reply

7 years ago

A 2.0 μF and a 4.0 μF capacitor are connected in series across an 8.0-V DC source. What is the ...

A 2.0 μF and a 4.0 μF capacitor are connected in series across an 8.0-V DC source. What is the charge on the 2.0 μF capacitor?
A) 2.0 μC
B) 4.0 μC
C) 12 μC
D) 11 μC
E) 25 μC

Northa 182 1 Reply

7 years ago

Two capacitors of 4 μF and 8 μF are connected in parallel. What is the equivalent capacitance of ...

Two capacitors of 4 μF and 8 μF are connected in parallel. What is the equivalent capacitance of this system of capacitors?
A) 0.4 μF
B) 12 μF
C) 2.7 μF
D) 4 μF
E) 6 μF

tankster 95 1 Reply

7 years ago

Four resistors of 20 Ω, 40 Ω, 60 Ω, and 80 Ω are connected across a 50-V DC source. What is the ...

Four resistors of 20 Ω, 40 Ω, 60 Ω, and 80 Ω are connected across a 50-V DC source. What is the current through this circuit?
A) 0.25 A
B) 0.50 A
C) 0.75 A
D) 2.0 A
E) 4.0 A

Brelou 76 1 Reply

7 years ago

Four resistors of 20 Ω, 40 Ω, 60 Ω, and 80 Ω are connected across a DC voltage source. If the ...

Four resistors of 20 Ω, 40 Ω, 60 Ω, and 80 Ω are connected across a DC voltage source. If the current through this circuit is 0.5 A, what is the voltage applied to this circuit?
A) 20 V
B) 40 V
C) 60 V
D) 80 V
E) 100 V

Northa 74 1 Reply

7 years ago

A 100-V DC signal is applied to a series circuit composed of four equal resistors 10 Ω each. What ...

A 100-V DC signal is applied to a series circuit composed of four equal resistors 10 Ω each. What is the voltage across each resistor?
A) 10 V
B) 15 V
C) 20 V
D) 25 V
E) 50 V

Brelou 81 1 Reply

7 years ago

A simple circuit has a total resistance of 30 Ω. If a 2.0-A current is maintained in this circuit, ...

A simple circuit has a total resistance of 30 Ω. If a 2.0-A current is maintained in this circuit, how much energy is dissipated in this circuit in 4.0 seconds?
A) 24 J
B) 4.8 J
C) 48 J
D) 480 J
E) 6.0 J

tankster 375 1 Reply

7 years ago

A light bulb operating at a voltage of 120 V has a resistance of 200 Ω. What is the power?

A light bulb operating at a voltage of 120 V has a resistance of 200 Ω. What is the power?
A) 100 W
B) 60 W
C) 72 W
D) 14 × 10-3 W
E) 7.2 W

Brelou 165 1 Reply

7 years ago

A 100-W light bulb is connected to a 110-V source. What is the resistance of this bulb?

A 100-W light bulb is connected to a 110-V source. What is the resistance of this bulb?
A) 100 Ω
B) 8.00 × 10-3 Ω
C) 6.00 × 10-3 Ω
D) 121 Ω
E) 242 Ω

Northa 118 1 Reply

7 years ago

The resistivity of the material of a wire is 1.76 × 10-8 Ωm. If the diameter of the wire is 2 × ...

The resistivity of the material of a wire is 1.76 × 10-8 Ωm. If the diameter of the wire is
2 × 10-3 m and its length is 2 m, what is its resistance?
A) 112 Ω
B) 11.2 Ω
C) 1.12 Ω
D) 0.112 Ω
E) 0.0112 Ω

Northa 210 1 Reply

7 years ago

The resistance of a 100-cm wire of cross sectional area 2 × 10-6 m2 is 400 Ω. What is the ...

The resistance of a 100-cm wire of cross sectional area 2 × 10-6 m2 is 400 Ω. What is the resistivity of the material of this wire?
A) 0.8 × 10-4 Ωm
B) 8 × 10-4 Ωm
C) 0.8 × 10-5 Ωm
D) 0.8 × 10-6 Ωm
E) 8 × 10-6 Ωm

tankster 193 1 Reply

7 years ago

The potential difference between the ends of a resistor is 9 V when a current of 1 A flows through ...

The potential difference between the ends of a resistor is 9 V when a current of 1 A flows through it. What is the value of that resistor?
A) 9 Ω s
B) 9 Ω/s
C) 9 V∙s
D) 9 V/s
E) 9 Ω

Brelou 99 1 Reply

7 years ago

A 2.0 μF capacitor is charged to 12. V and then discharged through 4 × 106 Ω. How long will it ...

A 2.0 μF capacitor is charged to 12. V and then discharged through 4 × 106 Ω. How long will it take for the voltage across the capacitor to drop to 3.0 V?

tankster 51 1 Reply

7 years ago

An RC circuit consists of 2.0 MΩ in series with a capacitor. When connected to a battery, the ...

An RC circuit consists of 2.0 MΩ in series with a capacitor. When connected to a battery, the capacitor becomes 25% charged in 1.5 seconds. What is the capacitance value?

Brelou 133 1 Reply

7 years ago

Given 3 capacitors: 4.00 μF, 7.00 μF, and 9.00 μF; what is the equivalent capacity if they are ...

Given 3 capacitors: 4.00 μF, 7.00 μF, and 9.00 μF; what is the equivalent capacity if they are connected in parallel?

Northa 96 1 Reply

7 years ago

Given 3 capacitors: 4.00 μF, 7.00 μF, and 9.00 μF; what is the equivalent capacity if they are ...

Given 3 capacitors: 4.00 μF, 7.00 μF, and 9.00 μF; what is the equivalent capacity if they are connected in series?

Brelou 67 1 Reply

7 years ago

Two 100 W lightbulbs are to be connected to a 120 V source. What is the current, potential ...

Two 100 W lightbulbs are to be connected to a 120 V source. What is the current, potential difference, and dissipated power for each when they are connected:
(a) in parallel (the normal arrangement)?
(b) in series?

Northa 48 1 Reply

7 years ago

A combination of 2.0 Ω in series with 4.0 Ω is connected in parallel with 3.0 Ω. What is the ...

A combination of 2.0 Ω in series with 4.0 Ω is connected in parallel with 3.0 Ω. What is the equivalent resistance?

Northa 82 1 Reply

7 years ago

Consider a 1.40 kW hair dryer operated on 120. V. What is (a)the current?(b)its resistance?

Consider a 1.40 kW hair dryer operated on 120. V. What is
(a) the current?
(b) its resistance?

Brelou 70 1 Reply

7 years ago

The power rating of a resistor is 0.800 W. The value of the resistor is 400 Ω. (a) What is the ...

The power rating of a resistor is 0.800 W. The value of the resistor is 400 Ω.
(a) What is the maximum voltage?
(b) What is the maximum current it can draw?

Brelou 214 1 Reply

7 years ago

What potential difference is required to cause 2.0 A to flow through a resistance of 8.0 Ω?

tankster 98 1 Reply

7 years ago

Kirchhoff's loop rule is a statement of

Kirchhoff's loop rule is a statement of
A) the law of conservation of momentum.
B) the law of conservation of charge.
C) the law of conservation of energy.
D) the law of conservation of angular momentum.
E) Newton's

tankster 149 1 Reply

7 years ago

Which one of the following is a correct statement for a number of resistors connected in series or ...

Which one of the following is a correct statement for a number of resistors connected in series or parallel?
A) The total resistance in a series circuit decreases as more resistors are added.
B) The flow of current is different through resi

Northa 78 1 Reply

7 years ago

The length of a certain wire is doubled and at the same time its radius is increased by a factor of ...

The length of a certain wire is doubled and at the same time its radius is increased by a factor of 4. What is the change in the resistance of this wire?
A) It is reduced by a factor of 8.
B) It increases by a factor of 8.
C) It is red

Brelou 93 1 Reply

7 years ago

The length of a certain wire is doubled and at the same time its radius is tripled. What is the ...

The length of a certain wire is doubled and at the same time its radius is tripled. What is the change in the resistance of this wire?
A) It stays the same.
B) It is reduced by a factor of 4.5.
C) It is doubled.
D) It is tripled.

Brelou 83 1 Reply

7 years ago

The length of a certain wire is doubled and at the same time its radius is reduced by a factor of 2. ...

The length of a certain wire is doubled and at the same time its radius is reduced by a factor of 2. What is the change in the resistance of this wire?
A) It is doubled.
B) It is quadrupled.
C) It increases by a factor of 6.
D) It

Northa 98 1 Reply

7 years ago

The length of a certain wire is doubled while its radius is kept constant. What is the change in the ...

The length of a certain wire is doubled while its radius is kept constant. What is the change in the resistance of this wire?
A) It stays the same.
B) It is doubled.
C) It is tripled.
D) It is quadrupled.
E) It is reduced by

tankster 92 1 Reply

7 years ago

Which one of the following is the correct statement regarding the resistance?

Which one of the following is the correct statement regarding the resistance?
A) The resistance of a conductor decreases with temperature.
B) The resistance of a semiconductor increases with temperature.
C) The resistance of a wire is

Northa 64 1 Reply

7 years ago

You are given a copper bar of dimensions 3 cm × 5 cm × 8 cm and asked to attach leads to it in ...

You are given a copper bar of dimensions 3 cm × 5 cm × 8 cm and asked to attach leads to it in order to make a resistor. If you want to achieve the largest possible resistance, you should attach the leads to the opposite faces that measure
A) 3

Brelou 101 1 Reply

7 years ago

Which one of the following is the correct expression for electric current?

Which one of the following is the correct expression for electric current?
A) I = ΔC/Δt
B) I = ΔR/Δt
C) I = ΔV/Δt
D) I = ΔQ/Δt
E) None of the other answers is correct.

Northa 66 1 Reply

7 years ago

An RC circuit is connected across a DC voltage source through an open switch. As soon as the switch ...

An RC circuit is connected across a DC voltage source through an open switch. As soon as the switch is closed, the capacitor charges linearly as a function of time.

tankster 182 1 Reply

7 years ago

Kirchhoff's voltage rule is an example of conservation of energy.

Northa 92 1 Reply

7 years ago

Four equal resistors connected in series have same current and same voltage across each resistor.

Brelou 110 1 Reply

7 years ago

A series circuit is a current divider and a parallel circuit is a voltage divider circuit.

Brelou 161 1 Reply

7 years ago

The resistivity of the material of a wire is inversely proportional to the resistance of the wire.

tankster 136 1 Reply

7 years ago

The resistance of a superconductor is infinite once it goes into the superconductivity state.

Northa 69 1 Reply

7 years ago

Electron flow is in the direction of conventional current.

Northa 88 1 Reply