The output of a dynamo using a splitting commutator is
|
(a) dc |
(b) ac |
|
(c) Fluctuating dc |
(d) Half-wave rectified voltage |
The output of a dynamo using a splitting commutator is
|
(a) dc |
(b) ac |
|
(c) Fluctuating dc |
(d) Half-wave rectified voltage |
(c) Fluctuating dc
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The dimension of (1/2)
: permittivity of free space; E : electric field) is
|
(a) |
(b) |
(c) |
(d) |
Two identical bar magnets are placed on above the other such that they are mutually perpendicular and bisect each other. The time period of this combination in a horizontal magnetic field is T. The time period of each magnet in the same field is
|
(a) |
(b) |
(c) |
(d) |
A solenoid is 1.5 m long and its inner diameter is 4.0 cm. It has three layers of windings of 1000 turns each and carries a current of 2.0 amperes. The magnetic flux for a cross-section of the solenoid is nearly
|
(a) 2.5 × 10–7 weber |
(b) 6.31 × 10–6 weber |
(c) 5.2 × 10–5 weber |
(d) 4.1 × 10–5 weber |
For driving a current of 2 A for 6 minutes in a circuit, 1000 J of work is to be done. The e.m.f. of the source in the circuit is
|
(a) 1.38 V |
(b) 1.68 V |
(c) 2.04 V |
(d) 3.10 V |
A dip needle vibrates in the vertical plane perpendicular to the magnetic meridian. The time period of vibration is found to be 2 seconds. The same needle is then allowed to vibrate in the horizontal plane and the time period is again found to be 2 seconds. Then the angle of dip is
|
(a) 0o |
(b) 30o |
(c) 45o |
(d) 90o |