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WorksheetsCh2 L2 - Magnetic Field due to a Current in a Solenoid
Total questions: 10
Worksheet time: 30mins
A solenoid has a length of 5.3 cm and consists of 80 turns of wire. The wire carries a constant current of 3.1 A. Calculate the strength of the magnetic field at the center of the solenoid.
9.2×10−7
5.9×10−3
3.1×10−4
7.4×10−5
A solenoid that has length 𝐿 and 𝑁 turns is connected to a battery that has emf V.What would happen to the magnetic flux density at its axis if we compressed the solenoid to decrease its length to half?
The magnetic flux density would double.
The magnetic flux density would stay the same.
The magnetic flux density would halve.
There is not enough information to determine the answer.
In the figure, a solenoid has a length of 0.3 m,240 turns, and a resistance of 9 Ω.The solenoid is connected to a circuit as shown below. The ratio of the magnetic flux density when the switch (K) is closed to the magnetic flux density when the switch (K) is open is
11/8
11/20
20/11
8/11
In the figure, the two solenoids, a and b, have the same number of turns and carry equivalent direct currents. The ratio of the magnetic flux density of coil a to the magnetic flux density of coil b is
2/1
1/2
1/1
The ratio cannot be determined from the given information.
In the figure below, a solenoid has 600 turns, and its length is 5𝜋 m. The solenoid is connected to a battery and a resistor 𝑅 in series. The solenoid south pole is produced at point c, and the magnetic flux density inside the solenoid is 3.6×10−4T . Which of the following is true?
The current is equal to 7.5 A and passes from b to a.
The current is equal to 15 A and passes from a to b.
The current is equal to 15 A and passes from b to a.
The current is equal to 7.5 A and passes from a to b.
A solenoid of negligible resistance that has length 𝐿 and 𝑁 turns that is uniformly distributed is connected to a circuit. What would happen to the magnetic flux density at the solenoid’s axis if half its length was cut and the remaining part was connected to the same circuit?
The magnetic flux density would stay the same.
The magnetic flux density would double.
The magnetic flux density would halve.
There is not enough information to determine the answer.
A circular coil has a radius of 20 cm, has 50 turns, and carries an electric current (𝐼) that generates a magnetic field of density 5×10−4T at its center. What is the magnetic flux density at a point on its axis if its turns are stretched to form a solenoid of length 10 cm?
1.3×10−4T
2.6×10−4T
1×10−3T
2×10−3T
A solenoid that has length 𝐿 and 𝑁 turns is connected to a battery that has emf V.What would happen to the magnetic flux density at its axis if we compressed the solenoid to decrease its length to half?
The magnetic flux density would halve.
The magnetic flux density would not change.
There is not enough information to determine the answer.
The magnetic flux density would double.
A wire that carries a constant current of 0.24 A is formed into a solenoid with 12 turns per centimeter. Calculate the strength of the magnetic field at the center of the solenoid
2×10−2T
3.6×10−4T
8.7×10−5T
3.6×10−6T
A circular coil has a radius of 20 cm,has 50 turns, and carries an electric current (𝐼) that generates a magnetic field of density 5×10−4T at its center. What is the magnetic flux density at a point on its axis if its turns are stretched to form a solenoid of length 10 cm?
1.3×10−4T
2.6×10−4T
1×10−3T
2×10−3T
