A long straight $$non-conducting$$ string carries a charge density of $$40$$ μ$$C/m$$. It is pulled along its length at a speed of $$300$$ $$m/s$$. What is the magnetic field at a normal distance of $$5$$ mm from the moving string?

Question

Infinity Learn · Accepted Answer

The moving string behaves like a current, $$thereforei=40$$  ×  $$10$$−$$6$$ $$C/m$$  $$300$$  $$m/s=1.2$$ ×  $$10$$−$$2$$ AThen   $$B=$$ μ$$0i2$$$$π$$r  $$=$$  $$2$$ × $$10$$−$$7$$ ×$$1.2$$ × $$10$$−$$2$$ $$0.005=$$  $$4.8$$  × $$10$$−$$7$$ T

A long straight non-conducting string carries a charge density of 40 μC/m. It is pulled along its length at a speed of 300 m/s. What is the magnetic field at a normal distance of 5 mm from the moving string?

Remember concepts with our Masterclasses.

Ready to Test Your Skills?

free study material