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(A) : In case of M.C.G the torque on the...

(A) : In case of M.C.G the torque on the coil is maximum in any position of the coil
(R) : In case of M.C.G the concave shaped magnetic poles render the field to be radial between them so that the plane of the coil is always parallel to the lines of induction even after deflection

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

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The correct Answer is:
A
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(A) : Torque on the coil is always maximum, when coil is suspended in a radial magnetic field. (R) : Torque depends upon the magnitude of the applied magnetic field.

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 100 turn closely wound circular coil of radius 10 cm carries a current of 3.2.A. (a) What is the field at the centre of the coil ? (b) What is the magnetic moment of this coil ? The coil is placed in vertical plane and is free to rotate about a horizontal axis which coincides with its diameter. A uniform magnetic field of 2T in the horizontal direction exists such that initially the axis of the coil is in the direction of the field. The coil rotates through an anlge of 90^(@) under the influence of the magnetic field. (c) What are the magnitudes of the torques on the coil in the initial and final position ? (d) What is the angular speed acquired by the coil when it has rotated by 90^(@) ? The moment of inertia of the coil is 0.1 kg m^(2)

Figure 6.20 shows a metal rod PQ resting on the smooth rails AB and positioned between the poles of a permanent magnet. The rails, the rod, and the magnetic field are in three mutual perpendicular directions. A galvanometer G connects the rails through a switch K. Length of the rod = 15 cm, B = 0.50 T, resistance of the closed loop containing the rod = 9.0 m Omega . Assume the field to be uniform. (a) Suppose K is open and the rod is moved with a speed of 12 cm s^(-1) in the direction shown. Give the polarity and magnitude of the induced emf. (b) Is there an excess charge built up at the ends of the rods when K is open? What if K is closed? (c) With K open and the rod moving uniformly, there is no net force on the electrons in the rod PQ even though they do experience magnetic force due to the motion of the rod. Explain. (d) What is the retarding force on the rod when K is closed? (e) How much power is required (by an external agent) to keep the rod moving at the same speed (=12 cm s^(-1) ) when K is closed? How much power is required when K is open? (f ) How much power is dissipated as heat in the closed circuit? What is the source of this power? (g) What is the induced emf in the moving rod if the magnetic field is parallel to the rails instead of being perpendicular?

A coil in the shape of an equilateral triangle of side 2 cm is suspended from a vertex such that it hangs in a vertical plane between the poles of a permanent magnet producing a horizontal magnetic field of 100 xx 10^(-3) T. the magnetic field is parallel to the plane of the coil. for the moment of cuple acting on the coil to be 2sqrt(3) xx 10^(-5) Nm, the current to be passed through the coil is

A rectangular loop of area 0.06 m2 is placed in a magnetic field of 0.3T with its plane (i) normal to the field (ii) inclined 30^(@) to the field (iii) parallel to the field. Find the flux linked with the coil in each case.

AAKASH SERIES-MOVING CHARGES AND MAGNETISM-EXERCISE-IB
  1. (A) : In electric circuits, wires carrying currents in opposite direct...

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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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