Hertzian dipole carries which type of current throughout its length while radiating?

A magnetic dipole of dipole moment $$\overrightarrow {\bf{m}} $$ is placed in a non-uniform magnetic field $$\overrightarrow {\bf{B}} .$$ If the position vector of the dipole is $$\overrightarrow {\bf{r}} ,$$ the torque acting on the dipole about the origin is

A

$$\overrightarrow {\bf{r}} \times \left( {\overrightarrow {\bf{m}} \times \overrightarrow {\bf{B}} } \right)$$

B

$$\overrightarrow {\bf{r}} \times \overrightarrow \nabla \left( {\overrightarrow {\bf{m}} .\overrightarrow {\bf{B}} } \right)$$

C

$$\overrightarrow {\bf{m}} \times \overrightarrow {\bf{B}} $$

D

$$\overrightarrow {\bf{m}} \times \overrightarrow {\bf{B}} + \overrightarrow {\bf{r}} \times \overrightarrow \nabla \left( {\overrightarrow {\bf{m}} .\overrightarrow {\bf{B}} } \right)$$

The radiation pattern of Hertzian dipole in the plane perpendicular to dipole is a

A

Null

B

Circle

C

Figure of eight

D

None of the above

If the radiation resistance of a Hertzian dipole is 100Ω, then the radiation resistance of short dipole is ____Ω.

A

25

B

50

C

73

D

35.6

When Hertzian dipole is connected to a practical antenna, which of the following fields is observed to be absent when a uniform current flow is observed?

A

Radiation field

B

Induction field

C

Electrostatic field

D

Both radiation and Induction Field

A Hertzian dipole consists of two _____ and ______ charges separated by a very short distance.

A

unequal, opposite

B

equal, same

C

equal, opposite

D

unequal, same

Practically we don’t use Hertzian dipole.

A

True

B

False

If the radiation resistance of a monopole is 18Ω, then the radiation resistance of a Hertzian dipole is _____________

A

124Ω

B

144Ω

C

164Ω

D

154Ω

Select the correct differences between char and varchar data types? i. varchar is non unicode and char is unicode character data type ii. char is ‘n’ bytes whereas varchar is actual length in bytes of data entered in terms of storage size iii. varchar is variable in length and char is the fixed length string iv. For varchar, if a string is less than the maximum length then it is stored in verbatim without any extra characters while for char if a string is less than the set length it is padded with extra characters to equalize its length to given length

A

i, iii, iv

B

ii, iii, iv

C

i, ii, iv

D

iii, iv

Two parallel connect SCRs have same voltage drop (Vt) having rated current = 2I1. SCR-1 carries a current of I1=2.6 A whereas SCR-2 carries a current of I2=1.4 A. Find the string efficiency.

A

45 %

B

77 %

C

92 %

D

84 %

A magnetic dipole of length 10 cm has pole strength of 20 Am. Find the magnetic moment of the dipole.

A

2 Am2

B

200 Am2

C

20 Am2

D

0.2 Am2

Hertzian dipole carries which type of current throughout its length while radiating?

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