- ANuclear force
- BCoulomb force
- CBoth A and B
- DGravitational force
Explanation:
Coulomb force is responsible for scattering of particles. When the alpha particles (positive in charge) get closer to the nucleus, which is positive in charge, they get repelled through various angles.
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Two electric dipoles of moment P and 64 P are placed in opposite direction on a line at a distance of 25 cm. The electric field will be zero at point between the dipoles whose distance from the dipole of moment P is
|
(a) 5 cm |
(b) |
(c) 10 cm |
(d) |
Large transformers, when used for some time, become hot and are cooled by circulating oil. The heating of transformer is due to
|
(a) Heating effect of current alone |
|
(b) Hysteresis loss alone |
|
(c) Both the hysteresis loss and heating effect of current |
|
(d) None of the above |
20 ampere current is flowing in a long straight wire. The intensity of magnetic field at a distance 10 cm from the wire will be
|
(a) 4 × 10–5 Wb/m2 |
(b) 9 × 10–5 Wb/m2 |
(c) 8 × 10–5 Wb/m2 |
(d) 6 × 10–5 Wb/m2 |
Consider the circuits shown in the figure. Both the circuits are taking same current from battery but current through R in the second circuit is th of current through R in the first circuit. If R is 11 W, the value of R1
|
(a) 9.9 W |
(b) 11 W |
(c) 8.8 W |
(d) 7.7 W |
If a proton and anti-proton come close to each other and annihilate, how much energy will be released
|
(a) 1.5 |
(b) 3 |
(c) 4.5 |
(d) None of these |
Two charged spheres of radii 10 cm and 15 cm are connected by a thin wire. No current will flow, if they have
|
(a) The same charge on each |
(b) The same potential |
|
(c) The same energy |
(d) The same field on their surfaces |
The amplification factor of a triode is 50. If the grid potential is decreased by 0.20 V, what increase in plate potential will keep the plate current unchanged
|
(a) 5 V |
(b) 10 V |
(c) 0.2 V |
(d) 50 V |