(a) Explanation Given Info: The rectangular copper block has the sides 10 cm,20 cm,40 cm The potential difference applied across the opposite sides are 6.0 V , The rectangular copper block has the sides 10 cm,20 cm,40 cm . The potential difference applied across the opposite sides are 6.0 V . Explanation : Formula to calculate the resistance of copper block is R = ρ l A R is the resistance of copper bock ρ is the resistivity of copper, A is the area of cross section of copper block, l is the length of the copper block, Suppose the voltage is applied in opposite faces separated by 10 cm , then the area of cross section is 20 cm×40 cm Substitute 10 cm for l , 1.70 × 10 − 8 Ω ⋅ m for ρ and 20 cm×40 cm for A in the above equation to find R 1 R 1 = ( 1.70 × 10 − 8 Ω ⋅ m ) ( 10 cm ) ( 20 cm×40 cm ) ( 1 cm 10 -2 m ) = 2.125 × 10 − 8 Ω Suppose the voltage is applied in opposite faces separated by 20 cm , then the area of cross section is 10 cm×40 cm Substitute 10 cm for l , 1.70 × 10 − 8 Ω ⋅ m for ρ and 20 cm×40 cm for A in the above equation to find R 2 R 2 = ( 1.70 × 10 − 8 Ω ⋅ m ) ( 20 cm ) ( 10 cm×40 cm ) ( 1 cm 10 -2 m ) = 8.5 × 10 − 8 Ω Suppose the voltage is applied in opposite faces separated by 40 cm , then the area of cross section is 10 cm×20 cm Substitute 40 cm for l 1 (b) To determine The minimum current of copper block

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ISBN: 9781305965522

Author: SERWAY

Publisher: CENGAGE L

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Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends o…

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Chapter 17, Problem 20P

(a)

To determine

The maximum and minimum current carried by the copper block

(b)

To determine

The minimum current of copper block

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Chapter 17, Problem 19P

Chapter 17, Problem 21P

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Chapter 17 Solutions

COLLEGE PHYSICS,V.2

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The maximum and minimum current carried by the copper block

Solution Summary: The author explains the formula to calculate the resistance of copper block is R=rho lA.

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The maximum and minimum current carried by the copper block

The minimum current of copper block

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Chapter 17 Solutions