When does the magnetic flux become zero?

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

Question

(B) The magnetic flux $\Phi_B$ through a surface is given by the formula $\Phi_B = \vec{B} \cdot \vec{A} = BA \cos 	heta$,where $\vec{B}$ is the magn

Vedclass · Accepted Answer

When the magnetic field is perpendicular to the area vector.

Vedclass · Answer

(B) The magnetic flux $\Phi_B$ through a surface is given by the formula $\Phi_B = \vec{B} \cdot \vec{A} = BA \cos 	heta$,where $\vec{B}$ is the magnetic field vector,$\vec{A}$ is the area vector,and $	heta$ is the angle between them.For the magnetic flux to be zero,we must have $\cos 	heta = 0$.This occurs when $	heta = 90^{\circ}$.An angle of $90^{\circ}$ between the magnetic field vector and the area vector means the magnetic field is perpendicular to the area vector (or parallel to the plane of the surface).Therefore,the correct option is $B$.

Similar Questions

An infinitely long wire lying along the $Y$-axis carries a current $I$ as shown in the figure. What is the magnetic flux through a circular loop of radius $R$ in the $xy$-plane? [Assume $\mu_0$ is the magnetic permeability of free space.]

Assertion $(A)$: Magnetic flux is a vector quantity.
Reason $(R)$: Value of magnetic flux can be positive, negative, or zero.

Imagine rolling a sheet of paper into a cylinder and placing a bar magnet near its end as shown in the figure. What can you say about the sign of $\vec B \cdot d\vec A$ for every area element $d\vec A$ on the surface of the cylinder?

The diagram shows the magnetic field lines of a bar magnet. $A$ coil is moved from above the magnet to below it and then back to the original position. Which of the following graphs best represents the variation of magnetic flux $\Phi$ through the coil with time $t$?

$A$ square loop of side $1\,m$ and resistance $1\,\Omega$ is placed in a magnetic field of $0.5\,T$. If the plane of the loop is perpendicular to the direction of the magnetic field,the magnetic flux through the loop is $\dots\dots$ weber.

Vedclass Test Series

Exam Paper Generator

Online Exam Module