Electromagnetic Induction & Alternating Currents-Induced EMF and Current [NEST (National Entrance Screening Test-NISER) Physics]: Questions 1 - 3 of 3

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Question 1

Appeared in Year: 2011

Question MCQ▾

In the circuit shown, the switch is closed at time t = 0.

Diagram of R-L Circuit at Time T = 0

Which of the graphs shown below best represents the voltage across the inductor, as seen on an oscilloscope?

Choices

Choice (4)Response

a.

Graph of Voltage Verses Time Choice – A

b.

Graph of Voltage Verses Time Choice – B

c.

Graph of Voltage Verses Time Choice – C

d.

Graph of Voltage Verses Time Choice – D

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Question 2

Appeared in Year: 2007

Question MCQ▾

A flexible conducting wire of rectangular shape of sides and , lies in the plane. There is a uniform magnetic field along the . The wire is deformed continuously in the same plane from shape to another rectangular shape of sides and . Let denote the magnetic flux through the loop. Then, independent of how the loop is deformed –

Wire Loops in Magnetic Field

Choices

Choice (4)Response

a.

is constant throughout the process.

b.

Since , there is no induced emf in the wire at any time.

c.

There is no heat generated in the entire process.

d.

The net charge flowing through the wire in the entire process is zero.

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Question 3

Appeared in Year: 2020

Question MCQ▾

Imagine a world where free magnetic charges exist. In this world, a circuit is made with a U shape wire and a rod free to slide on it. A current carried by free magnetic charges can flow in the circuit. When the circuit is placed in a uniform electric field, E perpendicular to the plane of the circuit and the rod is pulled to the right with a constant speed v, the “magnetic EMF” in the current and the direction of the corresponding current, arising because of changing electric flux will be (l is the length of the rod and c is speed of light) .

Choices

Choice (4)Response

a.

clockwise

b.

counterclockwise

c.

counterclockwise

d.

clockwise

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