Correct option is c 
if 
is changing.
Farady’s law states that time varying magnetic flux can induce an e.m.f. 
Electric field, Induced
![\[\mathrm{E}=-\frac{\mathrm{d} \phi}{\mathrm{dt}}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-e088713ef0bb1de98489b09a197c4dc7_l3.png "Rendered by QuickLaTeX.com")
![\[\begin{array}{l} E=-\frac{d \phi}{d t} \\ E=0 \text { only if } \frac{d \phi}{d t}=0 \end{array}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-e6b7f337bdac3dcb3caf04fd292fe18e_l3.png "Rendered by QuickLaTeX.com")
If 
, then 
const.
, then is changing
If the instantaneous magnetic flux and induced emf produced in a coil is and 
respectively, then according to Faraday’s law of electro magnetic induction:
A
E must be zero if 
and changing
B
if
C if is changing.
D
then must be zero
and respectively, then according to Faraday’s law of electro magnetic induction: A
E must be zero if and changing B
if C
if is changing. D
then must be zeroIf the instantaneous magnetic flux and induced emf produced in a coil is and respectively, then according to Faraday’s law of electro magnetic induction:
A E must be zero if and changing
B if
C if is changing.
D then must be zero
and respectively, then according to Faraday’s law of electro magnetic induction: A
E must be zero if and changing B
if C
if is changing. D
then must be zero
.
)
west of the geographic north. The north tip of the magnetic needle of a dip circle placed in the plane of magnetic meridian points above the horizontal. The horizontal component of the earth’s field is measured to be 
Specify the direction and magnitude of the earth’s field at the location.At a certain location in Africa, a compass points 
and 
carrying currents of 
and 
in the same direction are separated by a distance of 
. Estimate the force on a 
section of wire A.
wire carrying a current of 
is placed inside a solenoid perpendicular to its axis. The magnetic field inside the solenoid is given to be 
. What is the magnetic force on the wire?
and making an angle of 
with the direction of a uniform magnetic field of 
. What is the magnitude of the field 
at a point 
from the wire?
-turns carrying current 
.
is at distance 
from the wire. Find the force acting on the electron if its velocity is directed towards the wire.