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A plane electromagnetic wave of frequency 20 MHz travels through space along the x-direction. If the electric field vector at a certain point in space is 6 Vm^-1, what is the magnetic field vector at that point?

1) 2 x 10-8 T 2) (1/2) x 10-8 T 3) 2 T 4) (1/2) T Answer: 1) 2 x 10-8 T Solution: The magnetic field, B = E/c = 6/(3 x 108)... View Article

The maximum electric field in a plane electromagnetic wave is 900NC^–1. The wave is going in the x-direction and the electric field is in the y-direction. The maximum magnetic field in the wave is _____________T.

1) 3 x 10-8 2) 3 x 10-6 3) 27 x 10-6 4) 27 x 1010 Answer: 2) 3 x 10-6 Solution: The maximum value of the magnetic field, B0 = E0/c =... View Article

The speed of electromagnetic waves is the same

1) for all wavelengths 2) in all media 3) for all intensities 4) for all frequencies Answer: 3) for all intensities Solution: c... View Article

If the relative permeability and dielectric constant of a given medium are equal to l_r and K respectively, then the refractive index of the medium is equal to _____________

1) √IrK 2) √IrE0 3) √I0E0 4) 1/√IrK Answer: 1) √IrK Solution: Refractive index, n =... View Article

A plane electromagnetic wave is incident on a material surface. The wave delivers momentum P and energy E

1) P = 0, E ≠ 0 2) P ≠ 0, E = 0 3) P ≠ 0, E ≠ 0 4) P = 0, E = 0 Answer: 3) P ≠... View Article

If c is the speed of electromagnetic waves in vacuum, its speed v in a medium of dielectric constant K and relative permeability μ_r is

1) v = 1/√μrK 2) v = c √μrK 3) v = c/√μrK 4) v = k √μrc Answer: v = c √μrK... View Article

The electric field ( in NC^-1) in an electromagnetic wave is given by E = 50 sin ω (t-x/c) The energy stored in a cylinder of cross-section 10 cm² and length 100 cm along the x-axis will be

1) 5.5 x 10-12 J 2) 1.1 x 10-11 J 3) 2.2 x 10-11 J 4) 1.65 x 10-11 J Answer: 2) 1.1 x 10-11 J Solution: E = 50 sin ω... View Article

An electromagnetic wave is propagating along x-axis. At x = 1cm and t =10 s, its electric vector |E| = 6 V/m, then the magnitude of its magnetic vector is

1) 2 × 10-8 2) 3 × 10-7 3) 6 × 10-8 4) 5 × 10-7 Answer: 1) 2 × 10-8 Solution: Electric and magnetic fields are... View Article

AIR Spotlight – India’s Roadmap at the UN Climate Change Conference in Glasgow

AIR Spotlight is an insightful program featured daily on the All India Radio Newsonair. In this program, many eminent panellists discuss issues... View Article

Special Frontier Force – Vikas Battalion

The Special Frontier Force (SFF) is a paramilitary special force of India created on 14 November 1962. SFF is known as the Indian Army’s most... View Article

05 Nov 2021: UPSC Exam Comprehensive News Analysis

There is no CNA today since there is no edition of 'The Hindu' newspaper.... View Article

04 Nov 2021: PIB Summary & Analysis

There are no important articles in today's PIB.... View Article

04 Nov 2021: The Hindu Analysis

There is no edition of 'The Hindu' video analysis today on account of Diwali Holiday!... View Article

03 Nov 2021: PIB Summary & Analysis

There is no PIB analysis today on account of Diwali Holiday!... View Article

04 Nov 2021: UPSC Exam Comprehensive News Analysis

There is no edition of CNA today on account of Diwali holiday!... View Article

03 Nov 2021: The Hindu Analysis

UPSC Current Affairs Preparation: The Hindu Analysis Watch expert analysis of ‘The Hindu’ dated 03rd Nov 2021. Important news and views to boost... View Article

International Mother Language Day – February 21st

The United Nations Educational, Scientific and Cultural Organization (UNESCO) celebrates International Mother Language Day every year to promote... View Article

Difference Between IAS and PCS Officer

The Indian Administrative Service (IAS) and the Provincial Civil Service (PCS) are both civil services but one works directly under the... View Article

Aravalli Range [Geography & Environment Notes for UPSC]

The Aravalli Range located in the north-western part of India is one of the oldest fold mountain systems in the world, and in its current form... View Article

03 Nov 2021: UPSC Exam Comprehensive News Analysis

Nov 3rd, 2021, CNA:- Download PDF Here TABLE OF CONTENTS A. GS 1 Related B. GS 2 Related POLITY AND GOVERNANCE 1. Set up police complaints... View Article

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