MCQ
Force between two unit pole strength placed at a distance of one metre is
  • A
    $1 N$
  • B
    $\frac{10^{-7}}{4 \pi} N$
  • $10^{-7} N$
  • D
    $4 \pi \times 10^{-7} N$

Answer

Correct option: C.
$10^{-7} N$
$10^{-7} N$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

An extremely hot star would appear to be(a) Red   (b) Blue(c) Yellow(d) Orange
       
A conducting gas is in the form of a long cylinder. Current flows through the gas along the length of the cylinder. The current is distributed uniformly across the cross-section of the gas. Disregard thermal and electrostatic forces among the gas molecules. Due to the magnetic fields set up inside the gas and the forces which they exert on the moving ions, the gas will tend to:
The distance between a proton and electron both having a charge $1.6 \times 10^{-19}$ coulomb, of a hydrogen atom is $10^{-10}$ metre. The value of intensity of electric field produced on electron due to proton will be
Which is the factor that internal resistance does not depend on?
Which of the following gates will have an output of $1$
Two wires of the same material and equal length are joined in parallel combination.  If one of them has half the thickness of the other and the thinner wire has a resistance of 8 ohms, the resistance of the combination is equal to
Hole in semiconductor is:
Two identical parallel plate capacitors are connected in series to a battery of 100 V. A dielectric slab of dielectric constant 4.0 is inserted between the plates of second capacitor.  The potential difference across the capacitors will now be respectively(a) 50 V, 50 V(b) 80 V, 20 V(c) 20 V, 80 V(d) 75 V, 25 V
       
A glass convex lens $\left({\mu_{\mathrm{g}}}\right.= 1.5)$ has a focal length of $8 \ cm$ when placed in air. What would be the focal length of the lens when it is immersed in water $\left(\mu_{\mathrm{w}}=1.33\right)$
The temperature of a solid object is observed to be constant during a period. In this period:
  1. Heat may have been supplied to the body.
  2. Heat may have been extracted from the body.
  3. No heat is supplied to the body.
  4. No heat ia ertracted from the body.