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NEET - Grade 12 - Physics - Electromagnetic Induction - Introduction and Snapshot of Electromagnetic Induction - Study ref# 821

Introduction: Electricity and magnetism were considered separate and unrelated phenomena for a long time. In the early decades of the nineteenth century, experiments on electric current by Oersted, Ampere and a few others established t... read more

NEET - Grade 12 - Physics - Electromagnetic Induction - Introduction and Snapshot of Electromagnetic Induction - Study ref# 822

Following sections must be covered to understand the Electromagnetic Induction: 1. Introduction 2. The Experiments Of Faraday and Henry 3. Magnetic Flux 4. Faraday’s Law Of Induction 5. Lenz’s Law and Conservation Of Energy 6.... read more

NEET - Grade 12 - Physics - Electromagnetic Induction - Target Setup for Electromagnetic Induction - Study ref# 823

Student requires to achieve the following milestones to get better grip over Electromagnetic Induction. The milestones / targets are as follows: Starting Point: Days 0Test TypeAppear on TestTarget TestsScorePractice Test000%Chapt... read more

NEET - Grade 12 - Physics - Electromagnetic Induction - Study ref# 10543

A loop ,made of straight edges has six corners at A(0,0,0), B(L,0,0) C(L,L,0),D(0,L,0),E(0,L,L) and F(0,0,L). A magnetic field  Tesla is present in the region. The flux passing through the loop ABCDEFA (in that order) is (a) read more

NEET - Grade 12 - Physics - Electromagnetic Induction - Study ref# 10544

A cylindrical bar magnet is rotated about its axis in the figure. A wire is connected from the axis and is made to touch the cylindrical surface through a contact. Then (a) a direct current flows in the ammeter A. (b) no current fl... read more

NEET - Grade 12 - Physics - Electromagnetic Induction - Study ref# 10545

There are two coils A and B as shown in figure. A current starts flowing in B as shown, when A is moved towards B and stops when A stops moving. The current in A is counter clockwise. B is kept stationary when A moves. We can infer that ... read more

NEET - Grade 12 - Physics - Electromagnetic Induction - Study ref# 10546

In the figure given, mark the polarity of plates A and B of a capacitor when the magnets are quickly moved towards the coil. Answer: Accept both the answer:  A: +ve; B; -ve or A: -ve ; B; +ve From the figure, both magnets ... read more

NEET - Grade 12 - Physics - Electromagnetic Induction - Study ref# 10547

A solenoid is connected to a battery so that a steady current flows through it. If an iron core is inserted into the solenoid, will the current increase or decrease? Explain. Answer: As per Lenz’s law, direction of induced emf/ current in a ... read more

NEET - Grade 12 - Physics - Electromagnetic Induction - Study ref# 10548

Figure shows a current carrying solenoid moving towards a conducting loop. Find the direction of the current induced in the loop. Answer: From an observer, the direction of current in the solenoid is anti-clockwise. On displacing it towa... read more

NEET - Grade 12 - Physics - Electromagnetic Induction - Study ref# 10549

A conducting loop is held above a current carrying wire ‘PQ’ as shown in the figure. Depict the direction of the current induced in the loop when the current in the wire PQ is constantly increasing. Answer: It is observed that an increas... read more

NEET - Grade 12 - Physics - Electromagnetic Induction - Study ref# 10550

Two spherical bobs, one metallic and the other of glass, of the same size are allowed to fall freely from the same height above the ground. Which of the two would reach earlier and why? Answer: Glass, In glass, there is no effect of elect... read more

NEET - Grade 12 - Physics - Electromagnetic Induction - Study ref# 10551

A magnet is moving towards a coil with a uniform speed  as shown in the figure. State the direction of the induced current in the resistor R. Answer: From X to Y. As seen from the side of the approaching magnet the current inside t... read more

NEET - Grade 12 - Physics - Electromagnetic Induction - Study ref# 10552

A bar magnet is moved in the direction indicated by the arrow between two coils PQ and CD. Predict the direction of induced current in each coil. Answer: Clockwise in both coils or the direction of current is from P→Q and C→D... read more

NEET - Grade 12 - Physics - Electromagnetic Induction - Study ref# 10553

A long straight current carrying wire passes normally through the center of circular loop. If the current through the wire increases, will there be an induced emf in the loop? Answer: No, As the magnetic field due to current carrying wire... read more

NEET - Grade 12 - Physics - Electromagnetic Induction - Study ref# 10554

A rectangular frame of wire is placed in a uniform magnetic field directed outwards, normal to the paper. AB is connected to a spring which is stretched to  and then released at time t = 0.... read more

NEET - Grade 12 - Physics - Electromagnetic Induction - Study ref# 10555

State Lenz’s Law. A metallic rod held horizontally along east-west direction, is allowed to fall under gravity. Will there be an emf induced at its ends? Justify your answer. Answer: The polarity of induced emf is such that it tends to produ... read more

NEET - Grade 12 - Physics - Electromagnetic Induction - Study ref# 10556

A metallic ring of mass  and radius   is falling under gravity in a region having a magnetic field. If   is the vertical direction, the z-component of magnetic field is. If R is the resista... read more

NEET - Grade 12 - Physics - Electromagnetic Induction - Study ref# 10557

A rectangular conductor LMNO is placed in a uniform magnetic field of 0.5 T. The field is directed perpendicular to the plane of the conductor. When the arm MN of length of 20 cm is moved towards left with a velocity of read more

NEET - Grade 12 - Physics - Electromagnetic Induction - Study ref# 10558

A wheel with 8 metallic spokes each 50 cm long is rotated with a speed of 120 rev/ min in a plane normal to the horizontal component of the earth’s magnetic field. The earth’s magnetic field at the place is 0.4 G and the angle of dip is 60#*... read more

NEET - Grade 12 - Physics - Electromagnetic Induction - Study ref# 10559

A light bulb and a solenoid are connected in series across an  source of voltage. Explain, how the glow of the light bulb will be affected when an iron rod is inserted in the solenoid. Answer: Brightness decreases. Self- inductance of sol... read more

NEET - Grade 12 - Physics - Electromagnetic Induction - Study ref# 10560

Starting from the expression for the energy  , stored in a solenoid of self-inductance L to build up the current  obtain the expression for the magnetic energy in terms of the magnetic field B, area A and length  of the solenoid having... read more

NEET - Grade 12 - Physics - Electromagnetic Induction - Study ref# 10561

(i) Define mutual inductance. (ii) A pair of adjacent coils has a mutual inductance of 1.5 H. If the current in one coil changes from 0 to 20 A in 0.5 s, what is the change of flux linkage with the other coil? Answer: (i) Magnetic flux, link... read more

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