- ASpace surrounding the magnet in which magnetic force acts.
- BSpace surrounding the magnet in which electric force acts.
- CSpace surrounding the magnet in which no force acts.
- DNone.
Explanation:
A magnetic field is generated when electric charge carriers such as electrons move through space or within an electrical conductor. It is the space surrounding the magnet in which magnetic force acts. Its intensity is represented by magnetic lines of force.
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When the kinetic energy of an electron is increased, the wavelength of the associated wave will
|
(a) Increase |
|
(b) Decrease |
|
(c) Wavelength does not depend on the kinetic energy |
|
(d) None of the above |
A galaxy is observed to be moving with a velocity of 8600 km-sec–1. If it is at a distance of 430 million light year from us, Hubble constant and corresponding age of the universe are respectively
|
(a) 2 |
(b) 2 |
|
(c) |
(d) None of these |
An ammeter with internal resistance 90 Ω reads 1.85 A when connected in a circuit containing a battery and two resistors 700 Ω and 410 Ω in series. Actual current will be
|
(a) 1.85 A |
(b) Greater than 1.85 A |
|
(c) Less than 1.85 A |
(d) None of these |
62.5
electrons per second are flowing through a wire of area of cross-section 0.1
, the value of current flowing will be
|
(a) 1 A |
(b) 0.1 A |
(c) 10 A |
(d) 0.11 A |
Masses of three wires of copper are in the ratio of 1 : 3 : 5 and their lengths are in the ratio of 5 : 3 : 1. The ratio of their electrical resistances are
|
(a) 1 : 3 : 5 |
(b) 5 : 3 : 1 |
(c) 1 : 15 : 125 |
(d) 125 : 15 : 1 |
A star emits light of 5500 Å wavelength. Its appears blue to an observer on the earth, it means
|
(a) Star is going away from the earth |
(b) Star is stationary |
|
(c) Star is coming towards earth |
(d) None of the above |