Physics

# The dimensions of the strength of the electric field in resistivity:

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Single Correct Medium Published on 18th 08, 2020
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#### Realted Questions

Q1 Single Correct Medium
The dimensions of quantity $\dfrac{1}{\mu_0} (\vec{E} \times \vec{B})$ are:
$[\mu_0=$ permeability of free space, $\displaystyle E^1=$ electric field strength, $\displaystyle B^1=$ magnetic  field  induction $]$
• A. $[MT^{-3}]$
• B. $[ML^2T^{-3}]$
• C. $[ML^{-1}T^{-1}]$
• D. $[MT^{-3}A^2]$

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q2 Subjective Hard
A physical quantity P is related to four observables a, b, c and d as follows :
P $a^3\, b^2$ / $\sqrt{c}$ d
The percentage errors of measurement in a, b, c and d are 1%, 3%, 4% and 2%, respectively. What is the percentage error in the quantity P ? If the value of P calculated using the above relation turns out to be 3.763, to what value should you round off the result ?

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q3 Single Correct Hard
Taking frequency $f$, velocity $v$ and density $\rho$ to be the fundamental quantities then the dimensional formula for momentum will be?
• A. $\rho v^4f^{-3}$
• B. $\rho v^3f^{-1}$
• C. $\rho v f^2$
• D. $\rho^2v^2f^2$

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q4 Single Correct Medium
A wire of length $l=6\pm 0.06$cm and radius $r=0.5\pm 0.005$cm and mass $m=0.3\pm 0.003$ gm. Maximum percentage error in density is?
• A. $4$
• B. $2$
• C. $1$
• D. $6.8$

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q5 Subjective Medium
The distance of a galaxy is $56 \times10^{25}m$. Assume the speed of light to be $3\times10^8 m s^{-1}$. Express order of magnitude of time taken by light travelled to the galaxy.

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020