A metal rod consumes power P on passing current. If it is cut int

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271.

A metal rod consumes power P on passing current. If it is cut into two half and joined in parallel, it will consume power

  • P

  • 2P

  • P/4


C.

P/4

Let the resistance of the rod be R. If the rod is divided into two equal parts, then each part of the rod will have a resistance of R/2. Now these two parts of the rod are connected in parallel and a voltage Vis applied across them. Hence the total
power consumed is

        P' = V2R2  + V2R2

            = 4 V2R

      P' = 4P

Where P = V2R is  the power consumed by the original rod when voltage V is applied across it.


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272.

When a galvanometer is shunted by resistance S, its current capacity increases n times. If the same galvanometer is shunted by another resistance S', its current capacity will increase by n' is given by

  • (n+1)SS'

  • S (n-1)+ S'S'

  • n+SS'

  • S(n-1) + S'S'


273.

In moving coil galvanometer, the magnetic field used is

  • non-uniform

  • radial

  • uniform

  • None of these


274.

A charged particle enters in a strong perpendicular magnetic field. Then its kinetic energy

  • increases

  • decreases

  • remains constant

  • None of these


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275.

Calculate the current which will produce a deflection of 30° in a tangent galvanometer, if its reduction factor is 3 A.

  • 1.732 A

  • 0.732 A

  • 3.732 A

  • 2.732 A


276.

What is shape of· magnet in moving coil galvanometer to make the radial magnetic field?

  • Concave

  • Horseshoe magnet

  • Convex

  • None of the above


277.

A cyclotron can accelerate

  • β-particles

  • α-particles

  • high-velocity gamma rays

  • high-velocity X-rays


278.

A galvanometer coil has a resistance of 15 Ω and gives full-scale deflection for a current of 4 mA. To convert it to an ammeter of range 0 to 6 A

  • 10 mΩ resistance is to be connected in parallel to the galvanometer

  • 10 mΩ resistance is to be connected in series with the galvanometer

  • 0.1 Ω resistance is to be connected in parallel to the galvanometer

  • 0.1 Ω resistance is to be connected in series with the galvanometer


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279.

A solenoid 1.5 m long and 0.4 cm in diameter possesses 10 turns/cm length. A current of 5 A falls through it. The magnetic field at the axis inside the solenoid is

  • 2π × 10-3 T

  • 2π × 10-5 T

  • 4π × 10-2 T

  • 4π × 10-3 T


280.

A proton and a deuteron with the same initial kinetic energy enters a magnetic field in a direction perpendicular to the direction of the field. The ratio of the radii of the circular trajectories described by them is

  • 1 : 4

  • 1 : √2

  • 1 : 1

  • 1 : 2


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