A circular loop of flexible conducting materi | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) The magnetic flux $\phi$ through the loop is given by $\phi = B \cdot A$,where $B$ is the magnetic field and $A$ is the area of the loop.When the

Vedclass · Accepted Answer

Anti-clockwise current is induced

Vedclass · Answer

(B) The magnetic flux $\phi$ through the loop is given by $\phi = B \cdot A$,where $B$ is the magnetic field and $A$ is the area of the loop.When the loop is stretched outwards,its area $A$ increases.Since the magnetic field $B$ is directed into the plane,the magnetic flux through the loop increases.According to Lenz's Law,the induced current will flow in a direction that opposes this increase in magnetic flux.To oppose the increase in inward magnetic flux,the induced magnetic field must be directed outwards.By the right-hand thumb rule,a current flowing in a clockwise direction produces a magnetic field directed into the plane,while a counter-clockwise current produces a field directed outwards.Wait,let us re-evaluate: If the flux is directed into the plane and is increasing,the induced current must create a magnetic field directed out of the plane to oppose the change.Therefore,the induced current must be anti-clockwise.Correction: Re-checking the standard convention,if the area increases,the flux into the plane increases. To oppose this,the induced current must create a field out of the plane,which is anti-clockwise. However,if the loop is stretched,the flux increases. Lenz's law states the induced current opposes the change. Thus,the correct answer is $(b)$.

$A$ circular loop of flexible conducting material is kept in a magnetic field directed perpendicularly into its plane. By holding the loop at diametrically opposite points,it is suddenly stretched outwards,then

Similar Questions

Three resistances of magnitude $R$ each are connected in the form of an equilateral triangle of side $a$. The combination is placed in a magnetic field $B = B_0 e^{-\lambda t}$ perpendicular to its plane. The induced current in the circuit is given by:

The Lenz law is associated with

Two identical metallic square loops $L_1$ and $L_2$ are placed next to each other with their sides parallel on a smooth horizontal table. Loop $L_1$ is fixed and a current which increases as a function of time is passed through it. Then,loop $L_2$ is

If a coil of $40$ turns and area $4.0 \, cm^2$ is suddenly removed from a magnetic field,it is observed that a charge of $2.0 \times 10^{-4} \, C$ flows through the coil. If the resistance of the coil is $80 \, \Omega$,the magnetic flux density in $Wb/m^2$ is:

Write different methods to produce induced $emf$.

Vedclass Test Series

Exam Paper Generator

Online Exam Module