Verified Solution • 2025–26 Session moderate

QJEEM25Phdee2: JEE Main 2025 Physics - Class 11 JEEM25Phdee2 Solution: A satellite is launched into a circular orbit of radius ' R '…

A satellite is launched into a circular orbit of radius ' R ' around the earth. A second satellite is launched into an orbit of radius 1.03 R . The time period of revolution of the second satellite is larger than the first one approximately by

Multiple Choice Options

  • A 3%3 \%
  • B 2.5%2.5 \%
  • C 4.5%4.5 \%
  • D 9%9 \%

Step-by-Step Verified Solution

T∝R32T \propto R^{\frac{3}{2}}

For a satellite in a circular orbit with radius RR , the time period is given by

T=2πR3GM.T = 2\pi \sqrt{\frac{R^3}{GM}}.

If the radius is increased to 1.03R1.03R , the new time period T′T' becomes

T′=2π(1.03R)3GM=T×(1.03)32.T' = 2\pi \sqrt{\frac{(1.03R)^3}{GM}} = T \times (1.03)^{\frac{3}{2}}.

For a small change, we can approximate

(1.03)32≈1+32×0.03=1+0.045=1.045.(1.03)^{\frac{3}{2}} \approx 1 + \frac{3}{2} \times 0.03 = 1 + 0.045 = 1.045.

This means the new time period is approximately 4.5% larger than the original time period.

Thus, the time period of the second satellite is larger by approximately 4.5%.

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