Lenz's Law and Conservation of Energy
Lenz's Law and Conservation of Energy: Overview
This topic covers concepts, such as, Lenz's Law & Lenz's Law and Law of Conservation of Energy etc.
Important Questions on Lenz's Law and Conservation of Energy
A movable wire is moved to the right, that causes an anti-clock-wise induced current as shown in the figure. The direction of magnetic induction in the region P points

Lenz 's law used to find out the direction of

Lenz's law is a consequence of the law of conservation of

The negative sign in Lenz's law indicates that the flow of current support the change in flux.

State and explain Lenz's law in accordance with principle of conservation of energy.

Write down Lenz's law for electromagnetic induction and explain that Lenz's law follows the law of energy conservation.

As shown in the above figure, a magnet is pushed towards a fixed ring along its axis until the magnet passes through the ring. Now, choose the correct statement from the following:

In which direction will the induced current flow through the loop, at time ?

The magnetic field in the cylindrical region shown in figure increase at a constant rate of Each side of the square loop and has a length of and a resistance of Correctly match the current in the wire in four different situations as listed in column with the values given in column
Column I | Column II | ||
---|---|---|---|
(i) | The switch closed but is open | (a) | to |
(ii) | The switch open but is closed | (b) | to |
(iii) | Both and are open | (c) | to |
(iv) | Both and are closed | (d) | No current flows |

A uniform but time varying magnetic field is present in a cylindrical region of radius as shown in figure. The force on an electron at P at is

Which of the following statements is not correct?

A solenoid is connected to a battery so that a steady current flows through it. If an iron core is inserted into the solenoid, the current will

If a magnet is dropped through a vertical hollow copper tube, then

A bar magnet passes through a wire coil as shown in the figure. The acceleration of magnet is

An electron moves along the line AB which lies in the same plane as a circular loop of conducting wire as shown in figure. What will be the direction of current induced if any in the loop -

An aluminium ring B faces an electromagnet A. The current I through A can be altered -

The law of electromagnetic induction have been used in the construction of

An electron moves along the line with constant velocity which lies in the same plane as a circular loop of conducting wire as shown in figure. What will be the direction of current induced if any in the loop -

An electron moves along the line which lies in the same plane as a circular loop of conducting wire as shown in figure. What will be the direction of current induced if any in the loop,

A conducting wire frame is placed in a magnetic field, which is directed into the paper. The magnetic field is increasing at a constant rate. The directions of the induced currents in wires and are:
