- Alaw of conservation of energy
- Blaw of conservation of momentum
- Claw of conservation of angular momentum
- ✓law of conservation of charge
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Four charges are placed on corners of a square as shown in figure having side of 5cm. If Q is one microcoulomb, then electric field intensity at centre will be

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(a) 1.02 |
(b) 2.04 |
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(c) 2.04 |
(d) 1.02 |
To make the field radial in a moving coil galvanometer
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(a) The number of turns in the coil is increased |
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(b) Magnet is taken in the form of horse-shoe |
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(c) Poles are cylindrically cut |
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(d) Coil is wounded on aluminium frame |
In P-N junction, the barrier potential offers resistance to
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(a) Free electrons in N region and holes in P region |
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(b) Free electrons in P region and holes in N region |
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(c) Only free electrons in N region |
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(d) Only holes in P region |