Question
Explain what you understand by magnetic flux.
✓
Answer
The total number of magnetic lines of force passing normally through a given area in a magnetic field, is called the magnetic flux through that area.
Consider a very small area dA in a uniform magnetic field of induction $\vec{B}$. The area dA can be represented by a vector $\overrightarrow{d A}$ perpendicular to it.
[Note : The area vector is perpendicular to the sur-face, so it can point either up and to the right as shown or down and to the left. Although either choice is acceptable, choosing the direction that is closest to the magnetic field is convenient and usually the one we choose.]
Consider a very small area dA in a uniform magnetic field of induction $\vec{B}$. The area dA can be represented by a vector $\overrightarrow{d A}$ perpendicular to it.
[Note : The area vector is perpendicular to the sur-face, so it can point either up and to the right as shown or down and to the left. Although either choice is acceptable, choosing the direction that is closest to the magnetic field is convenient and usually the one we choose.]
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Derive the conditions for bright and dark fringes produced due to diffraction by a single slit.
Unpolarized light with intensity $I_0$ is incident on two polaroids. The axis of the first polaroid makes an angle of $50^\circ $ with the vertical, and the axis of the second polaroid is horizontal. What is the intensity of the light after it has passed through the second polaroid?
→A metallic ring of mass $1\ kg$ has moment of inertia $1\ kg\ m^2$ when rotating about one of its diameters. It is molten and remoulded into a thin uniform disc of the same radius. How much will its moment of inertia be, when rotated about its own axis.
→A $25 \mu F$ capacitor, $0.1 H$ inductor and $25 \Omega$ resistor are connected in series with an ac source of emf e $=220 \sin 314 t$ volt. What is the expression for the instantaneous value of the current?
→Derive an expression for the maximum safe speed for a vehicle on a circular horizontal road without toppling/overturning/rollover.
Think about the normal reactions. Where are those and how much are those?
Choosing different Amperean loops, show that out-side an ideal toroid $B = 0.$
→Represent graphically the variation of potential energy, kinetic energy and total energy of a particle performing SHM with time.
Radiation of wavelength 4500 Å is incident on a metal having work function 2.0 eV. Due to the presence of a magnetic field B, the most energetic photoelectrons emitted in a direction perpendicular to the field move along a circular path of radius 20 cm. What is the value of the magnetic field B?
Explain the concept/phenomenon of mutual induction.###Explain and define mutual inductance of a coil with respect to another coil.###Define the coefficient of mutual induction.