- ACobalt steel
- BAlmico
- CSoft magnetic material
- DStainless steel
Explanation:
A narrow hysteresis loop implies a small amount of dissipated energy. This occurs as a result of its small area and therefore more frequently repeated reversals of applied magnetising force. Soft magnetic are materials used in devices that require alternating magnetic fields have these narrow hysteresis shapes.
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Two batteries A and B each of e.m.f. 2 V are connected in series to an external resistance R = 1 ohm. If the internal resistance of battery A is 1.9 ohms and that of B is 0.9 ohm, what is the potential difference between the terminals of battery A
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(a) 2 V |
(b) 3.8 V |
(c) Zero |
(d) None of the above |
Assertion : The coil is bound over the metallic frame in moving coil galvanometer.
Reason : The metallic frame help in making steady deflection without any oscillation.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
The phenomenon of diffraction of light was discovered by
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(a) Hygens |
(b) Newton |
(c) Fresnel |
(d) Grimaldi |
The magnetic induction in the region between the pole faces of an electromagnet is 0.7 weber/m2. The induced e.m.f. in a straight conductor 10 cm long, perpendicular to B and moving perpendicular both to magnetic induction and its own length with a velocity 2 m/sec is
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(a) 0.08 V |
(b) 0.14 V |
(c) 0.35 V |
(d) 0.07 V |
In intrinsic semiconductor at room temperature, number of electrons and holes are
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(a) Unequal |
(b) Equal |
(c) Infinite |
(d) Zero |
The counting rate observed from a radioactive source at t = 0 second was 1600 counts per second and at t = 8 seconds it was 100 counts per second. The counting rate observed, as counts per second at t = 6 seconds, will be
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(a) 400 |
(b) 300 |
(c) 200 |
(d) 150 |
Thirteen resistances each of resistance R ohm are connected in the circuit as shown in the figure below. The effective resistance between A and B is
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(a) 2R W |
(b) |
(c) |
(d) R W |
Some equipotential surfaces of the magnetic scalar potential are shown in the figure. Magnetic field at a point in the region is

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(a) |
(b) 2 |
(c) 0.5 |
(d) None of these |