Ch 6. Electromagnetic Induction Flashcards
1
Q
When current in a coil changes from 5A to 2A in 0.1s then average voltage of 50V is produced. The self inducatance of the coil is
A
1.67 henry
2
Q
The self inducatance of a choke coil is 5 henry. The current through it is increasing at a rate of 2AS⁻¹. The self inducted emf in the choke coil will be
A
-10V
3
Q
In a closed circuit of resistance 10Ω, the linked flux varies with time according to relation φ = 6t² - 5t +1. At t = 0.25 second, the current (in ampere) flowing through the circuit is
A
0.2
4
Q
Lenz’s law is associated with
A
Energy
5
Q
SI unit of magnetic flux is
A
Weber
6
Q
One Henry is equal to
A
10³ mH
7
Q
The working of dynamo is based on the principle of
A
Electro-magnetic induction
8
Q
SI unit of self inductance is
A
Henry
