A coil has 200 turns and an area of 70 cm^2. | vedclass

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

Question

(B) The induced $e.m.f.$ is given by Faraday's law: $e = -N \frac{d\phi}{dt} = -N \frac{\phi_2 - \phi_1}{\Delta t}$.Here,$\phi = BA \cos 	heta$. Init

Vedclass · Accepted Answer

$8.4$

Vedclass · Answer

(B) The induced $e.m.f.$ is given by Faraday's law: $e = -N \frac{d\phi}{dt} = -N \frac{\phi_2 - \phi_1}{\Delta t}$.Here,$\phi = BA \cos 	heta$. Initially,the field is perpendicular to the plane,so $	heta_1 = 0^o$. After rotating by $180^o$,the angle becomes $	heta_2 = 180^o$.Given: $N = 200$,$A = 70 \ cm^2 = 70 	imes 10^{-4} \ m^2$,$B = 0.3 \ Wb/m^2$,$\Delta t = 0.1 \ s$.$e = -N \frac{BA(\cos 180^o - \cos 0^o)}{\Delta t}$$e = -200 	imes \frac{0.3 	imes 70 	imes 10^{-4} 	imes (-1 - 1)}{0.1}$$e = -200 	imes \frac{0.3 	imes 70 	imes 10^{-4} 	imes (-2)}{0.1}$$e = 200 	imes 0.3 	imes 70 	imes 10^{-4} 	imes 20 = 8.4 \ V$.

$A$ coil has $200$ turns and an area of $70 \ cm^2$. The magnetic field perpendicular to the plane of the coil is $0.3 \ Wb/m^2$ and it takes $0.1 \ s$ to rotate through $180^o$. The value of the induced $e.m.f.$ will be ...... $V$.

Similar Questions

In the given figure,the magnet is moved towards the coil with speed $v$ and the induced $emf$ is $e$. If the magnet and the coil recede away from one another,each moving with speed $v$,the induced $emf$ in the coil will be

Assertion : An induced current has a direction such that the magnetic field due to the current opposes the change in the magnetic flux that induces the current.
Reason : The above statement is in accordance with the conservation of energy.

If a copper ring is moved quickly towards the south pole of a powerful stationary bar magnet,then:

$A$ coil of $n$ turns and resistance $R \Omega$ is connected in series with a resistance $R/4$. The combination is moved for time $t$ seconds through a magnetic flux change from $\phi_1$ to $\phi_2$. The induced current in the circuit is:

The total emf induced in a closely wound coil of $N$ turns in which the magnetic flux linked with the coil is changing at the rate $\frac{d \phi_{B}}{dt}$ is

Vedclass Test Series

Exam Paper Generator

Online Exam Module