4.21 A straight horizontal conducting rod of length 0.45 m and mass 60 g is suspended by two vertical wires at its ends. A current of 5.0 A is set up in the rod through the wires.
(a) What magnetic field should be set up normal to the conductor in order that the tension in the wires is zero?
(b) What will be the total tension in the wires if the direction of current is reversed keeping the magnetic field same as before?
(Ignore the mass of the wires.) g = 9.8 m s–2.
4.21 A straight horizontal conducting rod of length 0.45 m and mass 60 g is suspended by two vertical wires at its ends. A current of 5.0 A is set up in the rod through the wires.
(a) What magnetic field should be set up normal to the conductor in order that the tension in the wires is zero?
(b) What will be the total tension in the wires if the direction of current is reversed keeping the magnetic field same as before?
(Ignore the mass of the wires.) g = 9.8 m s–2.
-
1 Answer
-
4.21 Length of the rod. l= 0.45 m
Mass suspended by the wire, m = 60 g = 60 kg
Acceleration due to gravity, g = 9.8 m/
Current, I = 5 A
To achieve zero tension, the magnetic field = weight of the wire
BIl = mg or
B = = = 0.26 T
The magnetic field should be set up such that it gives an upward magnetic force.
If the direction of current is reversed, then the magnetic force will act downwards and total tension in the wire will be
mg + BIl = 60 = 1.173 T
Similar Questions for you
There are two types of electricity - static and current. The current electricity is divided into Alternating Current (AC) and Direct Current (DC). Based on the production methods, electricity is divided into - heat, chemical, pressure, light and magnetism.
There are four types of power supply - switch-mode power supplies, linear power supplies, linear power supplies, and programmable power supplies
According to this law, at any point, magnetic field due to a tiny current element is directly proportional to the current element length.
Tesla (T) is the SI unit of magnetic field. Tesla is named after Nikola Tesla.
The different types of magnetism are - Diamagnetism, Paramagnetism, and Ferromagnetism.
Taking an Exam? Selecting a College?
Get authentic answers from experts, students and alumni that you won't find anywhere else
Sign Up on ShikshaOn Shiksha, get access to
- 65k Colleges
- 1.2k Exams
- 687k Reviews
- 1800k Answers