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Why small soft iron cylinder is placed a...

Why small soft iron cylinder is placed at the axis of the coil in galvanometer ?

A

to produced uniform radial magnetic field

B

for support of spring

C

to maintain electric potential difference

D

to produce tangential uniform magnetic field.

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The correct Answer is:
A
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KUMAR PRAKASHAN-MOVING CHARGES AND MAGNETISM-SECTION D (MULTIPLE CHOICE QUESTIONS)
  1. can measure small current and small voltage both.

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  2. has maximum resistance.

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  3. Why small soft iron cylinder is placed at the axis of the coil in galv...

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  4. What should be the resistance of an ideal ammeter ?

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  5. When series resistance is increased, range of voltmeter

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  6. When shunt connected to galvanometer has the value equal to resistance...

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  7. Which of following statements is wrong?

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  8. There are three voltmeters of same range with resistance 10,000Omega,8...

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  9. In order to increase the sensitivity of a moving coil galvanometer, s...

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  10. If range of an ammeter with resistance 5Omega is to be made double the...

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  11. is known as current sensitivity of a galvanometer.

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  12. is known as voltage sensitivity of galvanometer.

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  13. Relation between voltage sensitivity (sigma(v)) and current sensitivit...

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  14. When 50Omega resistance is connected to one voltmeter, its range is ob...

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  15. When 3 mA and 5 mA currents are passed through two galvanometers P and...

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  16. 1A current is passed through a parallel combination of 8Omega resistan...

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  17. When 2.5Omega shunt is connected with 25Omega resistance of galvanomet...

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  18. Give unit of torsional constant.

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  19. To turn galvanometer into ammeter,

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  20. Resistance of galvanometer is G. If shunt required to make its range n...

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