A cell of e. m.f. (E) and internal resistance (r) is connected to a variable resistor. A voltmeter is connected so as to measure the potential difference across the terminals of the cell. Which one of the
following is the correct circuit diagram of the arrangement?

Determine the maximum r-value of the polar equation r =3+3 cos 0

The seven sisters, seven stars located more than 400 light-years away in the taurus constellation can be seen here with venus and another constellation, orion. the seven stars stay grouped together but seem to move, like the planet venus. why do stars seem to move like planets in the night sky?

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?