The electromagnetic torque developed in any physical system, and with magnetic saturation neglected, acts in such a direction as to tend to ____________

The electromagnetic force and/or torque, developed in any physical system, acts in such a direction as to tend to ____________

A

decrease the magnetic stored energy at constant mmf

B

decrease the magnetic stored energy at constant flux

C

increase the magnetic stored energy at constant flux

D

increase the magnetic stored energy at constant current

Electromagnetic force and/or torque developed in any physical system, acts in such a direction as to tend to ____________

A

increase both the field energy and co-energy at constant current

B

increase the field energy and decrease the co-energy at constant current

C

decrease both the field energy and co-energy at constant current

D

decrease the field energy and increase the co-energy at constant current

The electromagnetic force developed in any physical system acts in such a direction as to tend to _____________

A

decrease the co-energy at constant mmf

B

increase the co-energy at constant flux

C

decrease the co-energy at constant flux

D

increase the co-energy at constant mmf

The developed electromagnetic force and/or torque in electromechanical energy conversion system, acts in such a direction that tends to ___________

A

increase the stored energy at constant mmf

B

decrease the stored energy at constant mmf

C

decrease the co-energy at constant mmf

D

increase the stored energy at constant flux

Consider a conducting loop of radius a and total loop resistance R placed in a region with a magnetic field B thereby enclosing a flux $${\phi _0}$$ . The loop is connected to an electronic circuit as shown, the capacitor being initially uncharged.
Electromagnetic Theory mcq question image

Electromagnetic Theory mcq question image

If the loop is pulled out of the region of the magnetic field at a constant speed u, the final output voltage V_out is independent of

A

$${\phi _0}$$

B

u

C

R

D

C

A circular arc QTS is kept in an external magnetic field $${\overrightarrow {\bf{B}} _0}$$ as shown in figure. The arc carries a current $$l$$. The magnetic field is directed normal and into the page. The force acting on the arc is
Electromagnetic Theory mcq question image

A

$$2l{B_0}R{\bf{\hat k}}$$

B

$$l{B_0}R{\bf{\hat k}}$$

C

$$ - 2l{B_0}R{\bf{\hat k}}$$

D

$$ - l{B_0}R{\bf{\hat k}}$$

Two magnetic dipoles of magnitude m each are placed in a plane as shown below. The energy of interaction is given by
Electromagnetic Theory mcq question image

A

zero

B

$$\frac{{{\mu _0}}}{{4\pi }} \cdot \frac{{{m^2}}}{{{d^3}}}$$

C

$$\frac{{3{\mu _0}}}{{2\pi }} \cdot \frac{{{m^2}}}{{{d^3}}}$$

D

$$ - \frac{{3{\mu _0}}}{{8\pi }} \cdot \frac{{{m^2}}}{{{d^3}}}$$

In the given question, a part of the sentence is printed in bold. Below the sentence, three alternatives to the bold part are given which may help improve the sentence. Choose the option that reflects the correct use of the phrase in the context of the sentence. In case the given sentence is correct, your answer is (E) i.e. No correction required. At first glance, it seems implausible that such an intricately engineered bio system such as our could have come about merely as a result of random modifications. i. such an intricately engineered bio system as ours ii. such intricately engineered bio system such as our iii. such intricately engineered bio system such as ours

A

Only I

B

Only ii

C

Only iii

D

Both ii and iii

At steady state operation in a 3-phase synchronous generator. (where Tem is developed electromagnetic torque developed in the machine and Tpm is the prime mover torque.)

A

Tem = Tpm

B

Tem > Tpm

C

Tem < Tpm

D

can not be coupled

In a doubly excited magnetic systems, the magnetic torques and forces act in such a direction as to tend to ___________

A

decrease the field energy at constant currents

B

decrease the field co-energy at constant currents

C

increase the field energy at constant currents

D

none of the mentioned

The electromagnetic torque developed in any physical system, and with magnetic saturation neglected, acts in such a direction as to tend to ____________

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