Two particles of equal charges after being accelerated through th

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsMultiple Choice Questions

61.

A proton, a deuteron and an α-particle having the same kinetic energy are moving in circular trajectories in a constant magnetic field. If rp, rand rα denote respectively the radii of the trajectories of these particles, then

  • rα = rd > rp

  • rα = rd = rp

  • rα < rd < rp

  • rα = rp > rd


62.

A solenoid has core of a material with relative permeability 500 and its windings carry a current of 1 A. The number of turns of the solenoid is 500 m-1. The magnetization of the material is nearly

  • 2.5 × 103 Am-1

  • 2.5 × 105 Am-1

  • 2.0 × 103 Am-1

  • 2.0 × 105 Am-1


63.

A 2 µC charge moving around a circle with a frequency of 6.25 x 1012 Hz produces a magnetic field 6.28 T at the centre of the circle. The radius of the circle is

  • 2.25 m

  • 0.25 m

  • 13.0 m

  • 1.25 m


64.

A galvanometer of resistance 100 Ω is converted to a voltmeter of range 10 V by connecting a resistance of 10 kΩ. The resistance required to convert the same galvanometer to an ammeter of range 1 A is

  • 0.4 Ω

  • 0.3 Ω

  • 0.1 Ω

  • 0.2 Ω


Advertisement
65.

Two wires with currents 2 A and 1 A are enclosed in a circular loop. Another wire with current 3 A is situated outside the loop as shown. Then B . dl around the loop is

            

  • µ0

  • 3 µ0

  • 6 µ0

  • 2 µ0


66.

A current I enters a circular coil of radius R, branches into two parts and then recombines as shown in the circuit diagram

               

The resultant magnetic field at the centre of the coil is

  • zero

  • μ0I2R

  • 34 μ0I2R

  • 14 μ0I2R


67.

The resistance of a galvanometer is 50 Ω and it shows full scale deflection for a current of 1 mA. To convert it into a voltmeter to measure 1 V and as well as 10 V (Refer circuit diagram) the resistances R1 and R2 respectively are

  • 950 Ω and 9150 Ω

  • 900 Ω and 9950 Ω

  • 900 Ω and 9900 Ω

  • 950 Ω and 9000 Ω


68.

Two long parallel wires carry currents i1 and i2 such that i1 >i2. When the currents are in the same direction, the magnetic field at a point midway between the wires is 6 x 10-6 T. If the direction of i2 is reversed, the field becomes 3 x 10-5 T. The ratio i1i2 is

  • 12

  • 2

  • 23

  • 32


Advertisement
69.

A coil of 100 turns and area 2 x 10-2 m2, pivoted about a vertical diameter in a uniform magnetic field carries a current of 5A. When the coil is held with its plane in North-South direction, it experiences a torque of 0. 3 Nm. When the plane is in East-West direction the torque is 0.4 Nm. The value of magnetic induction is (Neglect earth's magnetic field)

  • 0.2 T

  • 0.3 T

  • 0.05 T

  • 0.1 T


Advertisement

70.

Two particles of equal charges after being accelerated through the same potential difference enter a uniform transverse magnetic field and describe circular path of radii R1 and R2 respectively. Then the ratio of their masses (M1/M2)
(M,/M,) i

  • R1R2

  • R1R22

  • R2R1

  • R2R12


B.

R1R22

Radius of circular path,

          R = mvqBbut   mv = 2mqV      R=  2mqVqB  or  R  mor   R12R22 = M1M2  or  M1M2 = R12R22 = R1R22


Advertisement
Advertisement