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Electromagnetic Induction · Question 20

NEET 2016 (Phase 2)MCQMedium📈 Topic in 25% papers+4−1
1

A uniform magnetic field is restricted within a region of radius r. The magnetic field changes with time at a rate d Bdt. Loop 1 of radius R > r encloses the region r and loop 2 of radius R is outside the region of magnetic field as shown in the figure. Then the e.m.f. generated is [figure]

  1. zero in loop 1 and zero in loop 2
  2. - d Bdt r2 in loop 1 and - d Bdt r2 in loop 2
  3. - d Bdt R2 in loop 1 and zero in loop 2
  4. - d Bdt r2 in loop 1 and zero in loop 2

Answer

(4) - d Bdt r2 in loop 1 and zero in loop 2

Solution

Induced e.m.f. = - d dt, where is the flux through the loop.

Loop 1: field exists only over area r2 1 = B r2

1 = - dBdt r2

Loop 2: lies outside the field region 2 = 0 2 = 0

Answer: (4)

NEET 2016 (Phase 2)

Keep practising — Electromagnetic Induction

2

An electron moves on a straight line path XY as shown. The abcd is a coil adjacent to the path of electron. What will be the direction of current, if any, induced in the coil ? [figure]

  1. The current will reverse its direction as the electron goes past the coil
  2. No current induced
  3. abcd
  4. adcb
AIPMT 2015
3

A conducting square frame of side 'a' and a long straight wire carrying current I are located in the same plane as shown in the figure. The frame moves to the right with a constant velocity 'V'. The emf induced in the frame will be proportional to [figure]

  1. 1(2x+a)2
  2. 1(2x-a)(2x+a)
  3. 1x2
  4. 1(2x-a)2
AIPMT 2015 (Cancelled)
4

A thin semicircular conducting ring (PQR) of radius r is falling with its plane vertical in a horizontal magnetic field B, as shown in the figure. [figure] The potential difference developed across the ring when its speed is v, is

  1. zero
  2. Bv r22 and P is at higher potential
  3. rBv and R is at higher potential
  4. 2rBv and R is at higher potential
AIPMT 2014
5

A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced e.m.f. is

  1. four times per revolution
  2. six times per revolution
  3. once per revolution
  4. twice per revolution
NEET 2013
6

A current of 2.5 A flows through a coil of inductance 5 H. The magnetic flux linked with the coil is

  1. 0.5 Wb
  2. 12.5 Wb
  3. zero
  4. 2 Wb
NEET 2013 (Karnataka)
7

In a coil of resistance 10 , the induced current developed by changing magnetic flux through it, is shown in figure as a function of time. The magnitude of change in flux through the coil in weber is [figure]

  1. 8
  2. 2
  3. 6
  4. 4
AIPMT 2012 (Mains)
8

A coil of resistance 400 is placed in a magnetic field. If the magnetic flux (Wb) linked with the coil varies with time t (sec) as = 50t2 + 4. The current in the coil at t = 2 sec is

  1. 0.5 A
  2. 0.1 A
  3. 2 A
  4. 1 A
AIPMT 2012 (Prelims)
9

The current (I) in the inductance is varying with time according to the plot shown in figure. [figure] Which one of the following is the correct variation of voltage with time in the coil ?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2012 (Prelims)
10

The current i in a coil varies with time as shown in the figure. The variation of induced emf with time would be [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2011 (Prelims)
11

A conducting circular loop is placed in a uniform magnetic field, B = 0.025 T with its plane perpendicular to the field. The radius of the loop is made to shrink at a constant rate of 1 mm s-1. The induced emf when the radius is 2 cm, is

  1. 2
  3. 2
  4. 2
AIPMT 2010 (Prelims)

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