A coil having effective area 'A' is held with | vedclass

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

Question

(D) The formula for induced e.m.f. is $e = \frac{|\Delta \phi|}{\Delta t}$,where $\phi = BA \cos 	heta$. Since the plane is normal to the field,$	he

Vedclass · Accepted Answer

$\frac{3 BA}{4}$

Vedclass · Answer

(D) The formula for induced e.m.f. is $e = \frac{|\Delta \phi|}{\Delta t}$,where $\phi = BA \cos 	heta$. Since the plane is normal to the field,$	heta = 0^\circ$ and $\cos 0^\circ = 1$,so $\phi = BA$.The magnetic field changes from $B_1 = B$ to $B_2 = 0.25 B = \frac{1}{4} B$.The change in magnetic flux is $\Delta \phi = A(B_1 - B_2) = A(B - \frac{1}{4} B) = \frac{3}{4} AB$.Given the time interval $\Delta t = 1 	ext{ s}$.Substituting these values into the formula:$e = \frac{\frac{3}{4} AB}{1} = \frac{3}{4} AB$.

$A$ coil having effective area '$A$' is held with its plane normal to a magnetic field of induction '$B$'. The magnetic induction is quickly reduced to $25\%$ of its initial value in $1 \text{ s}$. The e.m.f. induced in the coil (in volt) will be

Similar Questions

Is relative motion an absolute condition for inducing an $emf$?

The north pole of a magnet is falling towards a metallic ring as shown in the figure. If looked at from above the ring,the direction of the induced current will be:

$A$ coil of resistance $400 \Omega$ is placed in a magnetic field. If the magnetic flux $\phi$ (Wb) linked with the coil varies with time $t$ $(s)$ as $\phi = 50t^2 + 4$,the current in the coil at $t = 2 \ s$ will be: (in $A$)

$A$ coil is placed in a magnetic field $\vec{B}$ as shown below. $A$ current is induced in the coil because $\vec{B}$ is:

The magnetic flux through a coil is $4 \times 10^{-4} \ Wb$ at time $t=0$. It reduces to $30 \%$ of its original value in time $t$ seconds. If the e.m.f. induced in the coil is $0.56 \ mV$,then the value of $t$ is: (in $s$)

Vedclass Test Series

Exam Paper Generator

Online Exam Module