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The wires which connect the battery of an automobile to its starting motor carry a current of 300 A (for a short time). What is the force per unit length between the wires if they are 70 cm long and 1.5 cm apart? Is the force attractive or

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A uniform magnetic field of 1.5 T exists in a cylindrical region of radius10.0 cm, its direction parallel to the axis along east to west. A wire carrying current of 7.0 A in the north to south direction passes through this region. What is the magnitude and direction of the force on the wire if,(i) the wire intersects the axis,(ii) the wire is turned from N-S to northeast-northwest direction,(iii) the wire in the N-S direction is lowered from the axis by a distance of 6.0

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A uniform magnetic field of 3000 G is established along the positive z-direction. A rectangular loop of sides 10 cm and 5 cm carries a current of 12 A. What is the torque on the loop in the different cases shown in Fig. What is the force on each case? Which case corresponds to stable

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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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(i) total torque on the coil,(ii) total force on the coil,m2(iii) 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 , and the free electron density in copper is given to be about 1029

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A solenoid 60 cm long and of radius 4.0 cm has 3 layers of windings of 300 turns each. A 2.0 cm long wire of mass 2.5 g lies inside the solenoid (near its centre) normal to its axis; both the wire and the axis of the solenoid are in the horizontal plane. The wire is connected through two leads parallel to the axis of the solenoid to an external battery which supplies a current of 6.0 A in the wire. What value of current (with appropriate sense of circulation) in the windings of the solenoid can support the weight

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A galvanometer coil has a resistance of 12 Ω and the metre shows full scale deflection for a current of 3 mA. How will you convert the metre into a voltmeter of range 0 to 18

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A galvanometer coil has a resistance of 15 Ω and the metre shows full scale deflection for a current of 4 mA. How will you convert the metre into an ammeter of range 0 to 6

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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In Fig. , the magnetic needle has magnetic moment 6.7 × 10–2 Am2 and moment of inertia I = 7.5 × 10–6 kg m2 . It performs 10 complete oscillations in 6.70 s. What is the magnitude of the magnetic

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A short bar magnet placed with its axis at 30° with an external field of 800 G experiences a torque of 0.016 Nm.(i) What is the magnetic moment of the magnet?(ii) What is the work done in moving it from its most stable to most unstable position?(iii) The bar magnet is replaced by a solenoid of cross-sectional area 2 × 10–4 m2 and 1000 turns, but of the same magnetic moment. Determine the current flowing through the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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What happens if a bar magnet is cut into two pieces: (a) transverse to its length, (b) along its

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A magnetised needle in a uniform magnetic field experiences a torque but no net force. An iron nail near a bar magnet, however, experiences a force of attraction in addition to a torque.

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Must every magnetic configuration have a north pole and a south pole? What about the field due to a

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Two identical looking iron bars A and B are given, one of which is definitely known to be magnetised. (We do not know which one.) How would one ascertain whether or not both are magnetised? If only one is magnetised, how does one ascertain which one? [Use nothing else

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A short bar magnet placed with its axis at 30° with an external field of 800 G experiences a torque of 0.016 Nm.What is the magnitude of the equatorial and axial fields due to a bar magnet of length 5.0 cm at a distance of 50 cm from its mid-point? The magnetic moment of the bar magnet is 0.40 A

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Fig. shows a small magnetised needle P placed at a point O. The arrow shows the direction of its magnetic moment. The other arrows show different positions (and orientations of the magnetic moment) of another identical magnetised needle Q. (i) In which configuration the system is not in equilibrium?(ii) In which configuration is the system in (i) stable, and (ii) unstable equilibrium?(iii) Which configuration corresponds to the lowest potential energy among all the configurations shown?

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The diagrams given in Fig. show magnetic field lines (thick lines in the figure) wrongly. Point out what is wrong with them.

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The diagrams given in Fig. show magnetic field lines (thick lines in the figure) wrongly. Point out what is wrong with them.

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The diagrams given in Fig. show magnetic field lines (thick lines in the figure) wrongly. Point out what is wrong with them.

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The diagrams given in Fig. show magnetic field lines (thick lines in the figure) wrongly. Point out what is wrong with them.

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The diagrams given in Fig. show magnetic field lines (thick lines in the figure) wrongly. Point out what is wrong with them.

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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