Choose the correct alternative:- The energy required to launch an orbiting satellite out of earth’s gravitational influence is `more//less` than the energy required to project a stationary object at the same height (as the satellite) out of earth’s influence.

Choose the correct alternative:- If the zero of potential energy is at infinity, the total energy of an orbiting satellite is negative of its kinetic//potential energy.

A satellite orbits the earth at a height of 400 km above the surface. How much energy must be expended to rocket the satellite out of the earth’s gravitational influence? Mass of the satellite = 200 kg, mass of the earth = 6.0xxl0^24 kg , radius of the earth = 6.4 xx 10^6 m , G = 6.67 xx 10^11 N m^2kg^2 .

Choose the correct alternative :- The formula -GMm (1//r_2 1//r_1) is more//less accurate than the formula mq(r_2- r_1) for the difference of potential energy between two points r_2 and r_1 , distance away from the centre of the earth.

As you have learnt in the text, a geostationary satellite orbits the earth at a height of nearly 36,000 km from the surface of the earth. What is the potential due to earth’s gravity at the site of this satellite ? (Take the potential energy at infinity to be zero). Mass of the earth = 6.0Xx10^24 kg , radius = 6400 km.

Direction. In the follwing questions, a statement of assertion is followed by a statement of reason. While answering a question, you are required to choose the correct are out of the given four responses and mark it as (A). If both assertion and reason are true and reason is the correct explanation of the assertion, (B) if both assertion and reason are true but reason is not correct explanation of the assertion. (C) if asssertion is true, but reason if false, (D) if assertion is false and reason is true Assertion : if the current in a solenoid is reversed in direction while keeping the same magnitude , the magnetic field energy stored in teh solenoid decreases. Reason : The magnetic field energy density is proportional to the square of magnetic field.

Direction. In the follwing questions, a statement of assertion is followed by a statement of reason. While answering a question, you are required to choose the correct are out of the given four responses and mark it as (A). If both assertion and reason are true and reason is the correct explanation of the assertion, (B) if both assertion and reason are true but reason is not correct explanation of the assertion. (C) if assertion is true, but reason if false, (D) if both assertion and reason are false Assertion : An alternating voltage of 220V is more dangerous than a d.c. supply of 220 V. Reason : The peak value of 220V a.c. is about 311 V.

In these question, a statement of assertion followed by a statement of reason is given .Choose the correct answer out of the following choices: Assertion and reason both are correct statements and reason is correct explanation for assertion. Assertion and reason both are correct statements but reason is not correct explanation for assertion. Assertion is correct statement but reason is wrong statement. Assertion is wrong statement but reason is correct statement. Assertion: in optical fibre, the diameter of the core is kept small. Reason: This smaller diameter of the core ensures that the fibre should have incident angle more than the critical angle required for total internal reflection.