Electromagnetic Induction & Alternating Currents (NEST (National Entrance Screening Test) Physics): Questions 1 - 1 of 3

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Question number: 1

» Electromagnetic Induction & Alternating Currents » Induced EMF and Current

Appeared in Year: 2007

MCQ▾

Question

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 –

Segment d Segment d: Segment [D, E] of Quadrilateral poly1Segment e Segment e: Segment [E, F] of Quadrilateral poly1Segment f Segment f: Segment [F, G] of Quadrilateral poly1Segment g Segment g: Segment [G, D] of Quadrilateral poly1Segment d_1 Segment d_1: Segment [D_1, E_1] of Quadrilateral poly1_1Segment e_1 Segment e_1: Segment [E_1, F_1] of Quadrilateral poly1_1Segment f_1 Segment f_1: Segment [F_1, G_1] of Quadrilateral poly1_1Segment g_1 Segment g_1: Segment [G_1, D_1] of Quadrilateral poly1_1Vector u Vector u: Vector [A, B] Vector u Vector u: Vector [A, B] Vector v Vector v: Vector [A, C] Vector v Vector v: Vector [A, C] Vector u_1 Vector u_1: Vector [A_1, B_1] Vector u_1 Vector u_1: Vector [A_1, B_1] Vector v_1 Vector v_1: Vector [A_1, C_1] Vector v_1 Vector v_1: Vector [A_1, C_1] X text1 = “X”Y text1_1 = “Y”Y text1_2 = “Y”X text1_3 = “X” (P) text2 = ” (P) “ (P) text2 = ” (P) “ (P) text2 = ” (P) “ (Q) text2_1 = ” (Q) “ (Q) text2_1 = ” (Q) “ (Q) text2_1 = ” (Q) “a text2_2 = “a”b text2_3 = “b”b text2_4 = “b”a text2_5 = “a”

Wire Loops in Magnetic Field

In figure, a flexible conducting wire of rectangular shape of sides a and b lies in xy plane.

Choices

Choice (4) Response

a.

is constant throughout the process.

b.

There is no heat generated in the entire process.

c.

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

d.

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

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