The expression for thermo e.m.f. in a thermocouple is given by the relation E = 40 θ - 
, where θ is the temperature difference of two junctions. For this, the neutral temperature will be
|
(a) 100℃ |
(b) 200℃ |
(c) 300℃ |
(d) 400℃ |
(d) 400℃
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Assertion : The earth’s magnetic field is due to iron present in its core.
Reason : At a high temperature magnet losses its magnetic property or magnetism.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
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(d) If assertion is false but reason is true. |
The deflection in a moving coil galvanometer is
|
(a) Directly proportional to the torsional constant |
|
(b) Directly proportional to the number of turns in the coil |
|
(c) Inversely proportional to the area of the coil |
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(d) Inversely proportional to the current flowing |
The inductance of a solenoid 0.5 m long of cross-sectional area 20 cm2 and with 500 turns is
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(a) 12.5 mH |
(b) 1.25 mH |
(c) 15.0 mH |
(d) 0.12 mH |
According to Gauss’ Theorem, electric field of an infinitely long straight wire is proportional to
|
(a) r |
(b) |
(c) |
(d) |
