
- AMagnetic field
- ✓Static electric field
- CInduced electric field
- DGravitational field

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Larger aperture of objective lens in an astronomical telescope:
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?
If two conducting spheres are separately charged and then brought in contact
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(a) The total energy of the two spheres is conserved |
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(b) The total charge on the two spheres is conserved |
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(c) Both the total energy and charge are conserved |
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(d) The final potential is always the mean of the original potentials of the two spheres |
Complete the reaction ![]()
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(a) |
(b) |
(c) |
(d) |
A small square loop of wire of side l is placed inside a large square loop of wire of side L (L > l). The loop are coplanar and their centre coincide. The mutual inductance of the system is proportional to
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(a) l / L |
(b) |
(c) L/l |
(d) |