- AParticle velocity
- BParticle acceleration
- CLinear momentum of the particle
- DKinetic energy of the particle
Explanation:
Magnetic field does zero work on moving charged particles. Therefore, kinetic energy of particle remains constant.
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The magnetic moment (μ) of a revolving electron around the nucleus varies with principal quantum number n as
|
(a) μ ∝ n |
(b) μ ∝ 1/n |
(c) μ ∝ |
(d) μ ∝ 1/ |
The speed of an electron having a wavelength of
is
|
(a) 7.25 × |
(b) 6.26 × |
(c) 5.25 × |
(d) 4.24 × |
A convex lens of ______ focal length gives a greater magnification than lenses of _______ focal length.
Comparing real and virtual images, we may say that:
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 |
What is the equivalent resistance between the points A and B of the network
|
(a) |
(b) 8 W |
(c) 6 W |
(d) |
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

|
(a) 1.02 |
(b) 2.04 |
|
(c) 2.04 |
(d) 1.02 |
If ne and vd be the number of electrons and drift velocity in a semiconductor. When the temperature is increased
|
(a) ne increases and vd decreases |
(b) ne decreases and vd increases |
| (c) Both ne and vd increases | (d) Both ne and vd decreases |
A metallic sphere has a charge of 10μC. A unit negative charge is brought from A to B both 100 cm away from the sphere but A being east of it while B being on west. The net work done is
|
(a) Zero |
(b) 2/10 joule |
(c) -2/10 joule |
(d) -1/10 joule |