MCQ
What is the space around a current-carrying conductor, in which its magnetic effect can be experienced called?
- AElectric field
- BMagnetic pole
- CMagnetic field
- DCharge distribution
Explanation:
The space around a current-carrying conductor, in which its magnetic effect can be experienced is called the magnetic field.
When a current is passed through a conductor, it modifies the space around the conductor and forms a magnetic field.
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The imaginary line passing through the pole and the center of curvature of the curved mirror is called its _______.
10 wires (same length, same area, same material) are connected in parallel and each has 1 Ω resistance, then the equivalent resistance will be
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(a) 10 Ω |
(b) 1 W |
(c) 0.1 W |
(d) 0.001 W |
A car is moving with at a constant speed of 60kmh-1 on a straight road. Looking at the rear view mirror, the driver finds that the car following him is at a distance of 100m and is approaching with a speed of 5kmh-1. In order to keep track of the car in the rear, the driver begins to glance alternatively at the rear and side mirror of his car after every 2s till the other car overtakes. If the two cars were maintaining their speeds, which of the following statement (s) is/are correct?
Assertion : The stars twinkle while the planets do not.
Reason : The stars are much bigger in size than the planets.
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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. |
|
(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
Two wires have resistance of 2W and 4W connected to same voltage, ratio of heat dissipated at resistance is
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(a) 1 : 2 |
(b) 4 : 3 |
(c) 2 : 1 |
(d) 5 : 2 |