Home
Class 12
PHYSICS
A flexible circular loop 20cm in diamete...

A flexible circular loop `20cm` in diameter lies in a magneic field with magnitude `1.0 T`, direction lies into the plane of the page as shown in Fig. 3.187. The loop is pulled at the points indicated by the arrws, forming a loop of zero area in `0.314s`.

The average induced emf in the circuit is

A

(a) `0.2 V`

B

(b) `0.1sV`

C

( c) `1 V`

D

(d) `10 V`

Text Solution

Verified by Experts

The correct Answer is:
B
(b)
`epsilon_(av) = -(DeltaPhi_(B))/(Deltat) = -B(DeltaA)/(Deltat) = -B((-pir)^(2))/(Deltat)`
Since the flux through the loop is decreasing, the induced current must produce a field that goes into the page. Therefore, the current flows in clockwise direction
`I_(av) = (epsilon_(av) )/(R ) = (0.1)/(0.01) = 10 A`
Promotional Banner

Topper's Solved these Questions

  • ELECTROMAGNETIC INDUCTION

    CENGAGE PHYSICS|Exercise Exercises Integer|9 Videos

  • ELECTROMAGNETIC INDUCTION

    CENGAGE PHYSICS|Exercise Archives Fill In The Blanks|3 Videos

  • ELECTROMAGNETIC INDUCTION

    CENGAGE PHYSICS|Exercise Exercises Asserton - Reasoning|8 Videos

  • ELECTROMAGENTIC INDUCTION

    CENGAGE PHYSICS|Exercise QUESTION BANK|40 Videos

  • ELECTRON,PHONTS,PHOTOELECTRIC EFFECT & X-RAYS

    CENGAGE PHYSICS|Exercise dpp 3.3|15 Videos

Similar Questions

Explore conceptually related problems

A flexible circular loop 20cm in diameter lies in a magneic field with magnitude 1.0 T , direction lies into the plane of the page as shown in Fig. 3.187. The loop is pulled at the points indicated by the arrws, forming a loop of zero area in 0.314s . if R = 0,01 Omega , the magnitude and direction of current flowing in the loop are

A circular loop of area 1cm^2 , carrying a current of 10 A , is placed in a magnetic field of 0.1 T perpendicular to the plane of the loop. The torque on the loop due to the magnetic field is

A wire in the form of a circular loop of radius 10 cm lies in a plane normal to a magnetic field of 100 T . If this wire is pulled to take a square shape in the same plane in 0.1 s , find the average induced emf in the loop.

A loop of flexible conducting wire of length 0.5 m lies in a magnetic field of 1.0 T perpendicular to the plane of the loop. Show that when a current as shown in Fig. 1.112 is passed through the loop, it opens into a circle. Also calculate the tension developed in the wire if the current is 1.57 A.

A conducting circular loop is placed in a magnetic field of strength 0.04 T, such that the plane of the loop is perpendicular to the magnetic field. If the radius of the loop begins to shrink at a constant rate of 0.5 mm // s , then calculate the emf induced in the loop when its radius is 1.5 cm.

A loop shown in the figure is immersed in the varying magnetic field B=B_0t , directed into the page. If the total resistance of the loop is R , then the direction and magnitude of induced current in the inner circle is

A circular loop of radius R=20 cm is placed in a uniform magnetic field B=2T in xy -plane as shown in figure. The loop carries a current i=1.0 A in the direction shown in figure. Find the magnitude of torque acting on the loop.

A rectangular loop of sides 20 cm and 10 cm carries a current of 5.0 A . A uniform magnetic field of magnitude 2 T exists parallel to the longer side of the loop. The torque acting on the loop is

A circular wire loop of radius r lies in a uniform magnetic field B, with its plane perpendicular to magnetic field. If the loop is deformed to a square shape in the same plane in time t, the emf induced in the loop is

The figure shows a uniform, 3.0 T magnetic field that is normal to the plane of a conducting, circular loop with a resistance of 1.5 Omega and a radius of 0.024 m. The magnetic field is directed out of the paper as shown . Note: The area of the non-circular portion of the wire is considered negligible compared to that of the circular loop. What is the magnitude of the average induced emf in the loop if the magnitude of the magnetic field is doubled in 0.4 s?

CENGAGE PHYSICS-ELECTROMAGNETIC INDUCTION-Exercises Linked Comprehension
  1. A flexible circular loop 20cm in diameter lies in a magneic field wit...

    Text Solution

    |

  2. A flexible circular loop 20cm in diameter lies in a magneic field wit...

    Text Solution

    |

  3. Figure. shows two parallel and coaxial loops. The smaller loop (radius...

    Text Solution

    |

  4. Figure 3.188 shows two parallel and coaxial loops. The smaller loop (r...

    Text Solution

    |

  5. A wire loop enclosing a semicircle of radius R islocated on the bounda...

    Text Solution

    |

  6. A wire loop enclosing a semicircle of radius R islocated on the bounda...

    Text Solution

    |

  7. In the circuit shown in Fig. the capacitor has capacitance C = 20 muF ...

    Text Solution

    |

  8. In the circuit shown in Fig. the capacitor has capacitance C = 20 muF...

    Text Solution

    |

  9. In the circuit shown in Fig. the capacitor has capacitance C = 20 muF ...

    Text Solution

    |

  10. Two long parallel conducting rails are placed in a uniform magnetic fi...

    Text Solution

    |

  11. Two long parallel conducting rails are placed in a uniform magnetic fi...

    Text Solution

    |

  12. Two long parallel conducting rails are placed in a uniform magnetic fi...

    Text Solution

    |

  13. A metal bar is moving with a velocity of v = 5 cm s^(-1) over a U-shap...

    Text Solution

    |

  14. A metal bar is moving with a velocity of v = 5 cm s^(-1) over a U-shap...

    Text Solution

    |

  15. In Fig. shown, the rod has a resistance R, the horizontal rails have n...

    Text Solution

    |

  16. In Fig. shown, the rod has a resistance R, the horizontal rails have n...

    Text Solution

    |

  17. In Fig. shown, the rod has a resistance R, the horizontal rails have n...

    Text Solution

    |

  18. A square conductind loop, 20.0 cm on a side placed in the same magneti...

    Text Solution

    |

  19. A square conductind loop, 20.0 cm on a side placed in the same magneti...

    Text Solution

    |

  20. A square conductind loop, 20.0 cm on a side placed in the same magneti...

    Text Solution

    |