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Kamila [148]
3 years ago
13

A resistor is made by winding a very long thin metal wire, insulated so adjacent coils do not touch. At room temperature, the re

sistance is 100 ohms.
If the resistor is then cooled to 77 K, the resistance:

A. changes only slightly, if at all.
B. increases significantly (more than a factor of two).
C. decreases significantly (more than a factor of 1/2).
Physics
1 answer:
Vladimir79 [104]3 years ago
3 0

Answer:

Option A

Explanation:

The correct answer is  Option A.

At room temperature, the resistance is equal to 100 ohms.

When the temperature is reduced to 77 K from room temperature, change in the resistance is very less.

The temperature coefficient of the resistivity of most of the metal is small for the metals which are approximately equal  0.01 /K.

hence, Change is only slightly.

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Answer:

E = 440816.32 N/C

Explanation:

Given data:

Three point charge of charge equal to +3.0 micro coulomb

fourth point charge = - 3.0 micro coulomb

side of square = 0.50 m

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Due to having equal charge on center of square, 2 charge produce equal electric field at center and other two also produce electric field at center of same value

So we have

E_1 + E_3 = 0

E =E_2 + E_4

E = 2 E_2

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plugging all value

E = 2 E_2

E = 2 E_2 =\frac{2\times k \times q}{r^2}

E = \frac{2 \times 8.99 \times 10^93\times 10^{-6}}{0.35^2}

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