Electric Charges And Fields

Question

Wired Faculty App

A coil of inductance 2 mH carrying a current 2A is given. If the current is reversed in 0.01 seconds, how much back e.m.f. is produced?

Solution

Given,

Self inductance, L = 2 mH
Current carried by the coil, I = 2 A

The current reverses in 0.01 s, this means the time period is 0.01/2 = 0.005 s.

Therefore,
Induced EMF,

ε = - L \frac{dI}{dt}

= 2 \times 10^{- 3} \times \frac{2}{0.005} = 0.8 V

Induced emf is also called as the back emf because it opposes any change in current assosciated with the coil.

Some More Questions From Electric Charges and Fields Chapter

Figure shows tracks of three charged particles in a uniform electrostatic field. Give the signs of the three charges. Which particle has the highest charge to mass ratio?

For Daily Free Study Material Join wiredfaculty

Electric Charges And Fields

A coil of inductance 2 mH carrying a current 2A is given. If the current is reversed in 0.01 seconds, how much back e.m.f. is produced?

Some More Questions From Electric Charges and Fields Chapter

Figure shows tracks of three charged particles in a uniform electrostatic field. Give the signs of the three charges. Which particle has the highest charge to mass ratio?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

Phone Number

Email Address

Location