Home
Class 12
PHYSICS
A uniform magnetic field of magnitude ...

A uniform magnetic field of magnitude 0.20 T exists in space from east to west what speed should a particle of mass 0.010 g and having a charge `1.0 X 10^(-5)C` be projected from south to north so that it moves with a uniform velocity?

Text Solution

Verified by Experts

`B = 0.2T` ,
`q= 1.0 xx 10^(-5) C`,
`m = 0.01g = 1 xx 10^(-5) kg`
Force dus to magnetic field = Gravitational force of attraction
So , `qVB = mg`
`rArr 1 xx 10^(-5) V xx 10 ^(-1) = 1 xx 10^(-5) xx 9.8`
`V= 4.9 xx 10 = 49m/s `.
Promotional Banner

Topper's Solved these Questions

  • MAGNETIC FIELD

    HC VERMA|Exercise Objective 2|9 Videos

  • LIGHT WAVES

    HC VERMA|Exercise Exercises|41 Videos

  • MAGNETIC FIELD DUE TO CURRENT

    HC VERMA|Exercise Exercises|61 Videos

Similar Questions

Explore conceptually related problems

A uniform magnetic field of 1.5 T exists in a cylindrical region of radius10.0 cm, its direction parallel to the axis along east to west. A wire carrying current of 7.0 A in the north to south direction passes through this region. What is the magnitude and direction of the force on the wire if, (a) the wire intersects the axis, (b) the wire is turned from N-S to northeast-northwest direction, (c) the wire in the N-S direction is lowered from the axis by a distance of 6.0 cm?

A uniform magnetic field of 0.3 T is established along the positive Z-direction. A rectangular loop in XY plane of sides 10 cm and 5 cm carries a current of I = 12 A as shown. The torque on the loop is _____

A circular ring of radius R with uniform positive charge density lambda per unit length is located in the y-z plane with its centre at the origin O. A particle of mass m and positive charge q is projected from the point P (Rsqrt3, 0, 0) on the positive x-axis directly towards O, with an initial speed v. Find the smallest (non-zero) value of the speed v such that the particle does not return to P.

A circular coil of 20 turns and radius 10 cm is placed in a uniform magnetic field of 0.10 T normal to the plane of the coil. If the current in the coil is 5.0 A, what is the (a) total torque on the coil, (b) total force on the coil, (c) average force on each electron in the coil due to the magnetic field? (The coil is made of copper wire of cross-sectional area 10^(-5) m^2 , and the free electron density in copper is given to be about 10^29 m^(-3) .)

A block of mass 15 kg is placed on a long trolley. The coefficien t of static friction between the block and the trolley is 0.18. The trolley accelerates from rest with 0.5 ms^(2) for 20 s and then moves with uniform velocity. Discuss the motion of the block as viewed by (a) a stationary observer on the ground, (b) an observer moving with the trolley.

Particles of masses 10 g and 20 g have position vectors (5,3,0) and (2,0,3) respectively. The position vector of their centre of mass is ………… cm.

A block of mass 15 kg is placed on a long trolley. The coefficient of static friction between the block and the trolley is 0.18. The trolley accelerates from rest with 0.5 m s^(-2) for 20 s and then moves with uniform velocity. Discuss the motion of the block as viewed by (a) a stationary observer on the ground, (b) an observer moving with the trolley.

A particle of mass 50 g is projected horizontally from the top of a tower of height 50 m with a velocity 20m//s . If g=10m//s^(2) , then find the :-

In a chamber, a uniform magnetic field of 6.5 G (1 G = 10^(-4) T) is maintained. An electron is shot into the field with a speed of 4.8 x× 10^6 m s^(-1) normal to the field. Explain why the path of the electron is a circle. Determine the radius of the circular orbit. (e = 1.5 x× 10^(-19) C, m_e = 9.1x×10^(-31) kg)

(a) A circular coil of 30 turns and radius 8.0 cm carrying a current of 6.0 A is suspended vertically in a uniform horizontal magnetic field of magnitude 1.0 T. The field lines make an angle of 60^@ with the normal of the coil. Calculate the magnitude of the counter torque that must be applied to prevent the coil from turning. (b) Would your answer change, if the circular coil in (a) were replaced by a planar coil of some irregular shape that encloses the same area? (All other particulars are also unaltered.)

HC VERMA-MAGNETIC FIELD-Exercises
  1. A nerrow beam of singly charged potassium ions of kinetic energy 32ke...

    Text Solution

    |

  2. Shows a convex lens of focal length 12 cm lying in a uniform magnetic...

    Text Solution

    |

  3. Electrons emitted with negligible speed from an electron gun are accel...

    Text Solution

    |

  4. Two particles, each having a mass m are placed at a separation d in a ...

    Text Solution

    |

  5. A uniform magnetic field of magnitude 0.20 T exists in space from e...

    Text Solution

    |

  6. A particle moves in a circle of diamater 1.0 cm under the action of ma...

    Text Solution

    |

  7. A proton goes undflected in a crossed electric and magnetic field (th...

    Text Solution

    |

  8. A particle having a charge of 5.0 mu C and a mass of 5.0x 10^(-12)kg ...

    Text Solution

    |

  9. A proton projected in a magnetic field of 0.020 T travels along a heli...

    Text Solution

    |

  10. A particle having mass m and charge q is released from the origin in a...

    Text Solution

    |

  11. An electron is emitted with negligible speed from th nagative plate of...

    Text Solution

    |

  12. A rectangular coil of 100 turns has length 5 cm and width 4 cm. it is ...

    Text Solution

    |

  13. A 50 turn circular coil of radius 2.0 cm carrying a current of 5.0 A ...

    Text Solution

    |

  14. A rectangular loop of sides 20 cm and 10 cm carries a current of 5.0 ...

    Text Solution

    |

  15. A circular coil of radius 2.0 cm has 500 turns in it and carries a cu...

    Text Solution

    |

  16. A circular loop carrting a current a current I has wire of total leng...

    Text Solution

    |

  17. A square coil of edge I having n turns carries a curent i. it is kept ...

    Text Solution

    |

  18. consider a nonconducting ring of radius r and mass m which has a toto...

    Text Solution

    |

  19. Consider a non conducting plate of radius a and mass m which has a cha...

    Text Solution

    |

  20. Consider a non conducting plate of radius a and mass m which has a cha...

    Text Solution

    |