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Q: Assume that the resistance = 3.9 ohms, the width of the rails is 2.2 m, the magnetic field magnitude…

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Q: How can it be shown that resistance alone does not determine the current to a motor armature? Why…

A: The armature of a motor is in every way similar to that of a generator. The   conductors on the…

Q: Direct currents move in one direction. O True O False

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Q: An electric fan continues in its motion even after the switch is put off, why?

A: Newton’s first law states that the body at rest remains at rest, or in motion, remains in motion at…

Q: Q1: A wire warped around the following ring with 100 turns. the diameter of ring is 10 cm.the…

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Q: A long straigt aive twisted into loop of radios is 0.1 m. a Current flows clock wise find the of the…

A: radius (r) = 0.1 m Current (I) = 20 A , clockwise

Q: Show that the Hall voltage across wires made of the same material, carrying identical currents, and…

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Q: What happens when current stops flowing through a solenoid?

A: Current stops in a solenoid

Q: How fast must a straight 0.25m wire move through a 5.5x10-³T magnetic field in order to induce a…

A: Let B denotes the magnetic field, L denotes the wire’s length, V denotes the motional emf, and v…

Q: One simple, though impractical, way to generate electrical power is shown below. A bar of metal with…

A: Given data: The magnetic field around the bar, B= 0.75T The velocity of the bar, v=0.4m/s The length…

Q: At what velocity (in revolutions per minute) will the peak voltage of a generator be 490 V, if its…

A: Peak voltage , εmax = 490 V Number of turns , N = 490  Diameter , D = 8 cm  Radius , R = 4 cm = 0.04…

Q: When you turn the shaft of an electric motor by hand, what occurs in the interior coils of wire?

A: The coil of the wire rotates as you turn the shaft of an electric motor by hand.

Q: The current through A is 0.50 A when the switch S is open. What will the current be through A when…

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Q: Current is i nduced in a conductina loop that lies in a Zontal plane, t the induced Current is…

A: According to Lenz's law Induced emf always opposes the cause by which it is produced

Q: Imagine a conductor on rails that completes the circuit below. There is also a magnetic field with…

A: Induced emf=lVB So i=E/R And recall P=iV

Q: Why are the wingspans of birds a consideration in determining the spacing between parallel wires in…

A: Answer:   When the wingspans of birds are adequate to cross the parallel wires that are having…

Q: ii) Discuss what will the force be if the following situation is changed so that the wires are…

A: Current in 1st wire is I1 = 8 A Current in second wire is I2 = 4 A Distance between the wires is R =…

Q: The self-inductance of the circuit in the figure below is 1.10 x 10-7H. Find the back emf when the…

A: Given: The inductance of the circuit is 1.1x10-7 H. The rate of current increasing at the rate of…

Q: what will happen to the current directions if the polarity of the nine-volt battery is reversed?

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Q: o no current is induced o clockwise o counter-clockwise

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Q: One simple, though impractical, way to generate electrical power is shown below. A bar of metal vith…

A: given: B=0.75 TR = 3 ohmv = 0.4 m/s l= 15 cm = 0.15 m

Q: through a circuit should be placed in such a way that the axis of its coilis alng the east-west…

A: Galvanoscope is a mechanical device that shows both the direction and magnitude of the current. It…

Q: Why does an induced current always oppose the change that makes it?

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Q: What is the current in a wire loop of resistance 10 Ω through which the magnetic flux changes from…

A: Given  Magnetic field, ∆φ=10 Wb Time ∆t=1 s Resistance, R=10 Ω

Q: Is the direction of the current (toward or away from the positive terminal) the same in all wires or…

A: Required : The direction of the current flow.

Q: Next, we will investigate what happens when there are two loops. We will think about/investigate the…

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Q: A two-legged core is shown in Figure. The winding on the left leg of the core has 600 turns, and the…

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Q: An air-cored solenoid with length 30 cm, area of cross-section 25 cm2 and number of turns 500,…

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Q: A coil of wire is connected to a meter. When a bar magnet is moved in and out of the coil, the meter…

A: A meter is attached to a coil of wire. The meter registers a current when a bar magnet is inserted…

Q: One simple, though impractical, way to generate electrical power is shown below. A bar of metal with…

A:

Q: What is the current in the second wire? are the two current in the same direction or in opposite…

A: (a) Force per unit length between the two wires

Q: 9 A melal of borwith mass m car slide over 2 frictan less , Paralel metal rails wheh are separated…

A:

Q: 14.9 Check Your Understanding For the circuit of in Figure 14.12(b), show that when steady state is…

A: Energy stored in an Inductor in RL circuit:

Q: How inductance is used in traffic lights?

A: Inductance - Inductance is tendency to oppose the change of electric current flowing through it.…

Q: At what speed must the sliding rod in the figure below move to produce an emf of 1.10 V in a 1.77 T…

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Q: Two long, parallel wires are separated by a distance of 2.5 cm. The force perunit length that each…

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Q: The net voltage change around any loop is zero. It means that:

A: Voltage or electric potential difference is the difference in the electric potential between the two…

Q: The self-inductance of the circuit in the figure below is 1.10  10-7 H. Find the back emf when the…

A:

Q: Which is more likely to interfere with compass readings, AC current in your refrigerator or DC…

A: The direction of AC current changes with a specific time interval. Hence, the compass needle will…

Q: In the circuit shown in Figure below, when switch is suddenly closed, the wire L is pulled toward…

A: Given : The circuit wire L is pulled to the current carrying wire I when the circuit is switched on.