Loading [MathJax]/jax/output/CommonHTML/jax.js

A parallel plate capacitor with circular plates of radius 1 m has a capacitance of 1 nF. At t=0, it is connected for charging in series with a resistor R=1 MΩ across a 2 V battery (as shown in the figure). The magnetic field at a point P, halfway between the centre and the periphery of the plates, after t=103 s is: 
(the charge on the capacitor at the time t is q(t)=CV[1e(t/𝜏)], where the time constant τ is equal to CR.

1. 0.74×1013 T
2. 0.67×1013 T
3. 0.74×1012 T
4. 0.67×1012 T

Subtopic:  Maxwell's Equations |
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
Links
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

A plane electromagnetic wave of frequency 25 MHz travels in free space along the x-direction. At a particular point in space and time, E0=6.3ˆj V/m. What is B0 at this point?
1. 2.1×108ˆk T
2. 1.2×108ˆk T
3. 2.1×108ˆj T
4. 1.2×108ˆj T

Subtopic:  Properties of EM Waves |
 79%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
Links
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The magnetic field in a plane electromagnetic wave is given by B=(2×107)sin(0.5×103x+1.5×1011t) T. The wavelength and frequency of the wave are respectively:
1. 2.16 cm,24.1 GHz 2. 0.29 cm,13.7 GHz
3. 3.23 cm,20.0 GHz 4. 1.26 cm,23.9 GHz
Subtopic:  Properties of EM Waves |
 74%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
Links
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

advertisementadvertisement

The magnetic field in a plane electromagnetic wave is given by;
By=(2×107)sin(0.5×103x+1.5×1011t) T.
The expression for the electric field is:
1. Ez=60sin(0.5×103x+1.5×1011t) V/m
2. Ez=60sin(1.5×103x+0.5×1011t) V/m
3. Ez=55sin(0.5×103x+1.5×1011t) V/m
4. Ez=55sin(1.5×103x+0.5×1011t) V/m
Subtopic:  Properties of EM Waves |
 83%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
Links
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Light with an energy flux of 18 W/cm2 falls on a non-reflecting surface at normal incidence. If the surface has an area of 20 cm2, what is the average force exerted on the surface during a 30 minute time span?
1. 2.1×106 N
2. 1.8×106 N
3. 1.2×106 N
4. 2.1×105 N

Subtopic:  Properties of EM Waves |
 57%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
Links
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Assume a bulb of efficiency 2.5% as a point source. The peak values of the electric field and magnetic field produced by the radiation coming from a 100 W bulb at a distance of 3 m are respectively:

1. 2.5 V/m, 2.2×108 T
2. 3.6 V/m, 3.6 T
3. 4.07 V/m, 1.4×108 T
4. 4.2 V/m, 3.4×106 T
Subtopic:  Properties of EM Waves |
 53%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
Links
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

advertisementadvertisement