- AMagnetic moment per unit volume.
- BMagnetic induction force acting on a unit magnetic pole.
- CNumber of lines of force crossing per unit area.
- DNumber of lines of force crossing per unit volume.
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Two similar bar magnets P and Q, each of magnetic moment M, are taken, If P is cut along its axial line and Q is cut along its equatorial line, all the four pieces obtained have
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(a) Equal pole strength |
(b) Magnetic moment |
|
(c) Magnetic moment |
(d) Magnetic moment M |
Two uniform wires A and B are of the same metal and have equal masses. The radius of wire A is twice that of wire B. The total resistance of A and B when connected in parallel is
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(a) 4 Ω when the resistance of wire A is 4.25 Ω |
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(b) 5 Ω when the resistance of wire A is 4.25 Ω |
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(c) 4 Ω when the resistance of wire B is 4.25 Ω |
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(d) 4 Ω when the resistance of wire B is 4.25 Ω |

A copper disc of radius 0.1 m is rotated about its centre with 10 revolutions per second in a uniform magnetic field of 0.1 Tesla with its plane perpendicular to the field. The e.m.f. induced across the radius of disc is
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(a) |
(b) |
(c) π |
(d) 2π |
An extremely hot star would appear to be
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(a) Red |
(b) Blue |
(c) Yellow |
(d) Orange |
Two normal uniform magnetic field contain a magnetic needle making an angle 60° with F. Then the ratio of is
| (a) 1 : 2 | (b) 2 : 1 |
(c) |
(d) 1 : |
This symbol represents

|
(a) NOT gate |
(b) OR gate |
(c) AND gate |
(d) NOR gate |