A system S consists of two coils A and B. The | vedclass

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

Question

(A) When the system is heated,the resistance of the coils increases due to the rise in temperature. Since the coil $A$ is connected to a source,the in

Vedclass · Accepted Answer

The two coils show attraction.

Vedclass · Answer

(A) When the system is heated,the resistance of the coils increases due to the rise in temperature. Since the coil $A$ is connected to a source,the increase in its resistance causes the current $I$ in coil $A$ to decrease steadily. According to Faraday's law of electromagnetic induction,a changing current in coil $A$ produces a changing magnetic flux through coil $B$. This changing magnetic flux induces an electromotive force (emf) and consequently an induced current in coil $B$. According to Lenz's law,the induced current in coil $B$ will flow in such a direction as to oppose the cause of its production,which is the decrease in current in coil $A$. To oppose the decrease in current,the induced current in coil $B$ will flow in the same direction as the current in coil $A$. Two parallel coils carrying currents in the same direction attract each other. Therefore,the two coils show attraction.

$A$ system $S$ consists of two coils $A$ and $B$. The coil $A$ carries a steady current $I$. The coil $B$ is suspended nearby as shown in the figure. If the system is heated,so as to raise the temperature of the two coils steadily,then:

Similar Questions

$A$ rectangular coil of $100$ turns and size $0.1 \,m \times 0.05 \,m$ is placed perpendicular to a magnetic field of $0.1 \,T$. If the field drops to $0.05 \,T$ in $0.05 \,s$, the magnitude of the e.m.f. induced in the coil is (in $\,V$)

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

$A$ magnetic field of $2 \times 10^{-2} \, T$ acts at right angles to a coil of area $100 \, cm^2$ with $50$ turns. The average emf induced in the coil is $0.1 \, V$,when it is removed from the field in time $t$. The value of $t$ is $... \, sec$.

$A$ rectangular loop of wire is coplanar with a long wire carrying current $I$. The loop is pulled to the right as indicated. What are the directions of the induced current in the loop and the magnetic forces on the left and the right sides of the loop?

$A$ bar magnet is moved along the axis of a copper ring placed far away from the magnet. Looking from the side of the magnet,an anticlockwise current is found to be induced in the ring. Which of the following may be true?

Vedclass Test Series

Exam Paper Generator

Online Exam Module