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SSC JE 2017: Electromagnetic Theory Rankers Quiz 3

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Question 1

The voltage across 5-H inductor is

Find the energy stored at t = 5s. Assume zero initial current.

Question 2

The energy stored in the magnetic field of a solenoid 30cm long and 3cm diameter with 1,000 turns of wire carrying current of 10 A is:

Question 3

Point out the WRONG statement regarding magnetic flux density as per the biot-savert law

Question 4

A magnetic circuit carries a flux ϕ_i in the iron part and a flux ϕ_g in the air gap. Then leakage co-efficient is:

Question 5

A wire bent into a semi-circle in the centre and straight at both ends is placed in a uniform magnetic field B pointing out of the page shown in the figure. If the wire carries current I, the force on each straight section xy and zw is ____________.

Question 6

The material used for the magnetic circuit where high value of flux density required is ____________.

Question 7

The relative permeability of paramagnetic material is __________.

Question 8

The magnetic potential difference in a magnetic circuit is given by

Question 9

Following Figure shows a cross-section of a coil. Based on dot and cross notation, which end of the coil is the north pole?
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Question 10

A very long solenoid has 800 turns per metre length of the solenoid. A current of 1.6 A flows through it. Then magnetic flux density at the end of the solenoid on its axis is nearly

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ESE & GATE EE Electromagnetic Fields

Feb 28ESE & GATE EE