{"questions":[{"id":"mdcat-phy-elec-01","v":1,"subject":"physics","chapter":"electrostatics","seed":true,"difficulty":2,"stem":"If the distance between two point charges is doubled, the electric force between them becomes:","options":["Half","One quarter","Double","Four times"],"answer":1,"explain":{"en":"Coulomb's law: F = kq₁q₂/r². Doubling r multiplies r² by 4, so the force falls to one quarter.","ur":"کولمب کا قانون: F = kq₁q₂/r²۔ فاصلہ دگنا کرنے سے r² چار گنا ہوتا ہے، اس لیے قوت ایک چوتھائی رہ جاتی ہے۔"},"source":{"kind":"parcha-original"},"status":"sample","exam":"mdcat"},{"id":"mdcat-phy-elec-02","v":1,"subject":"physics","chapter":"electrostatics","difficulty":1,"stem":"The magnitude of the charge on an electron is:","options":["1.6 × 10⁻¹⁹ C","9.1 × 10⁻³¹ C","1.6 × 10¹⁹ C","6.25 × 10¹⁸ C"],"answer":0,"explain":{"en":"e = 1.6 × 10⁻¹⁹ C (the electron's charge is −e). 9.1 × 10⁻³¹ kg is the electron's mass, and 6.25 × 10¹⁸ is the number of electrons in one coulomb.","ur":"e = 1.6 × 10⁻¹⁹ C (الیکٹران کا چارج −e ہے)۔ 9.1 × 10⁻³¹ kg الیکٹران کا ماس ہے اور 6.25 × 10¹⁸ ایک کولمب میں الیکٹرانوں کی تعداد ہے۔"},"source":{"kind":"parcha-original"},"status":"sample","exam":"mdcat"},{"id":"mdcat-phy-elec-03","v":1,"subject":"physics","chapter":"electrostatics","difficulty":1,"stem":"The SI unit of electric field intensity is:","options":["N C","C/N","J/C","N/C"],"answer":3,"explain":{"en":"Field intensity E = F/q, so its unit is newton per coulomb (N/C), which equals volt per metre (V/m). J/C is the volt, the unit of potential.","ur":"برقی میدان E = F/q، اس لیے اکائی نیوٹن فی کولمب (N/C) ہے جو وولٹ فی میٹر (V/m) کے برابر ہے۔ J/C وولٹ ہے، پوٹینشل کی اکائی۔"},"source":{"kind":"parcha-original"},"status":"sample","exam":"mdcat"},{"id":"mdcat-phy-elec-04","v":1,"subject":"physics","chapter":"electrostatics","difficulty":1,"stem":"The SI unit of capacitance is the:","options":["Henry","Farad","Tesla","Ohm"],"answer":1,"explain":{"en":"Capacitance C = Q/V, measured in farads (1 F = 1 C/V). The henry is inductance, the tesla magnetic field, and the ohm resistance.","ur":"کپیسیٹینس C = Q/V، اکائی فیراڈ (1 F = 1 C/V)۔ ہینری انڈکٹنس، ٹیسلا مقناطیسی میدان اور اوہم مزاحمت کی اکائی ہے۔"},"source":{"kind":"parcha-original"},"status":"sample","exam":"mdcat"},{"id":"mdcat-phy-elec-05","v":1,"subject":"physics","chapter":"electrostatics","difficulty":2,"stem":"Two 4 μF capacitors are connected in parallel. Their combined capacitance is:","options":["2 μF","4 μF","8 μF","16 μF"],"answer":2,"explain":{"en":"In parallel, capacitances add: 4 + 4 = 8 μF. In series they would give 1/C = 1/4 + 1/4, so C = 2 μF.","ur":"متوازی میں کپیسیٹینس جمع ہوتی ہے: 4 + 4 = 8 μF۔ سیریز میں 1/C = 1/4 + 1/4، یعنی C = 2 μF ہوتا۔"},"source":{"kind":"parcha-original"},"status":"sample","exam":"mdcat"},{"id":"mdcat-phy-elec-06","v":1,"subject":"physics","chapter":"electrostatics","difficulty":2,"stem":"Electric field lines:","options":["Start on negative and end on positive charges","Form closed loops","Never cross each other","Are densest where the field is weakest"],"answer":2,"explain":{"en":"Field lines start on positive and end on negative charges, never cross (the field has one direction at each point), and are closest together where the field is strongest. Closed loops are a feature of magnetic field lines.","ur":"میدان کی لکیریں مثبت سے شروع ہو کر منفی پر ختم ہوتی ہیں، ایک دوسرے کو کبھی نہیں کاٹتیں (ہر نقطے پر میدان کی ایک ہی سمت ہے) اور جہاں میدان مضبوط ہو وہاں گھنی ہوتی ہیں۔"},"source":{"kind":"parcha-original"},"status":"sample","exam":"mdcat"}]}