Lenz's Law and Conservation of Energy

IMPORTANT

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

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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


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Lenz 's law used to find out the direction of

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

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

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

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

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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:

MEDIUM
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In which direction will the induced current flow through the loop, at time t=2.00 s?

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The magnetic field in the cylindrical region shown in figure increase at a constant rate of 10.0 mT s-1. Each side of the square loop abcd and defa has a length of 2.00 cm and a resistance of 2.00 Ω. Correctly match the current in the wire ad in four different situations as listed in column I with the values given in column II.

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  Column I   Column II
(i) The switch S1 closed but S2 is open (a) 5×10-7A, d to a
(ii) The switch S1 open but S2 is closed (b) 5×10-7A, a to d
(iii) Both S1 and S2 are open (c) 2.5×10-8A, d to a
(iv) Both S1 and S2 are closed (d) No current flows

HARD
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A uniform but time varying magnetic field B=2t3+24t T is present in a cylindrical region of radius R=2.5 cm as shown in figure. The force on an electron at P at t=2.0 s is

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Which of the following statements is not correct?

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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

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

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

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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 -

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An aluminium ring B faces an electromagnet A. The current I through A can be altered -
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EASY
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The law of electromagnetic induction have been used in the construction of

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An electron moves along the line AB with constant velocity V 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 -


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MEDIUM
IMPORTANT

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,

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HARD
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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 AB and CD are:

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