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(A) : The coil is wound over the metalli...

(A) : The coil is wound over the metallic frame in moving coil galvanometer.
(R) : The metallic frame help in making steady deflection without any oscillation.

A

Both 'A' and 'R' are true and 'R' is the correct explanation of 'A'.

B

Both 'A' and 'R' are true and 'R' is not the correct explanation of 'A'

C

'A' is true and 'R' is false

D

'A' is false and 'R' is false

Text Solution

Verified by Experts

The correct Answer is:
A
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When a current is passed in moving coil galvanometer, the coil gets deflected because,

(A) : Earth's magnetic field does not affect the working of a moving coil galvanometer. (R) : The earth's magnetic field is quite weak as compared to magnetic field produced in the moving coil galvanometer.

Why the coil of a dead beat galvanometer is would on a metal frame?

(A) : Working of a moving coil galvanometer is based on heating effect of current. (R) : On heating, the coil starts to rotate in moving coil galvanometer because fo torque.

The area of the coil in a moving coil galvanometer is 16 cm^(2) and has 20 turns. The magnetic induction is 0.2T and the couple per unit twist of the suspended wire is 10^(-6) Nm per degree. If the deflection is 45° calculate the current passing through it.

AAKASH SERIES-MOVING CHARGES AND MAGNETISM-EXERCISE-IB
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  2. (A) : When two long parallel wires, hanging freely are connected in pa...

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  3. (A) : Torque on the coil is always maximum, when coil is suspended in ...

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  4. (A) : In case of M.C.G the torque on the coil is maximum in any positi...

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  5. (A) : Earth's magnetic field does not affect the working of a moving c...

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  6. (A) : The coil is wound over the metallic frame in moving coil galvano...

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  7. (A) : The tangent galvanometer can be made more sensitive by increasin...

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  8. (A) : Working of a moving coil galvanometer is based on heating effect...

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  9. (A) : A tangent galvanometer is used for measuring current. (R) : Ta...

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  10. (A) : Reduction factor (K) of a tangent galvanoinete helps in reducing...

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  11. (A) : A nonconducting ring having charge q uniformly distributed is ro...

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  12. (A) : Increasing the current sensitivity of an MCG may not necessarily...

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  13. (A) :· The range of given voltmeter can be both increased and decrease...

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  14. (A) : Voltmeter put across a part of the circuit, it reads slightly le...

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  15. (A) : The resistance of voltmeter is very small as compared to the res...

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  16. (A) : A galvanometer can be used as an ammeter and Voltmeter. (R) : ...

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  17. (A) : An ammeter is connected in series in the circuit. (R) : An amm...

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  18. (A) : If a galvanometer is converted into an ammeter and a milliammete...

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  19. (A) : Higher the range, lower is the resistance of ammeter. (R) : To...

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  20. (A) : Voltmeter is connected in parallel with the circuit (R) : Resi...

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