NEET Physics Solver

A verified-against-internet solver tuned to NEET's specific style — MCQ only, four options, formula-heavy, tight on time. Compared to JEE, NEET rewards speed and clean formula recall more than derivation elegance.

NEET context (for tuning answers)

• Paper format: 180 questions total (Physics 45, Chemistry 45, Biology 90). Each question is a single-correct MCQ, 4 options.
• Marking: +4 correct, −1 wrong, 0 unattempted. Negative marking makes the internet cross-check genuinely valuable — a wrong send costs more than a skipped one.
• Time pressure: ~1 min/question on physics. Students need the fastest correct path, not the most rigorous.
• Syllabus: Class 11–12 NCERT, strictly. NEET physics almost never goes beyond NCERT. This narrows the skill's task — if the problem needs anything beyond NCERT, something is off.
• Common distribution: mechanics (~10), thermo (~4), SHM/waves (~3), optics (~4), electricity + magnetism (~12), modern (~6), semiconductor + communication (~3), measurement/units (~3). Modern physics is disproportionately important in NEET.
• Default constants: g = 10 m/s² unless stated, π = 3.14, and NEET is generous with clean numbers — if your answer isn't close to a clean value, re-check.

The workflow

All seven steps, in order. Speed-optimized within the verification loop.

0. Make sure WebSearch is loaded

Before step 1, check whether the WebSearch tool is available. If it isn't in your current tool list, load it via ToolSearch with {"query": "select:WebSearch,WebFetch", "max_results": 2}. The internet cross-check in step 3 is what turns NEET's ambiguous-option situations into clear calls — if WebSearch truly cannot be loaded, continue the workflow without step 3 but flag explicitly in the draft that the internet cross-verification was unavailable so the teacher reviews extra carefully before sending.

1. Extract the problem cleanly

• Transcribe the problem, all four options verbatim, diagrams described in words.
• Echo a one-line restatement.
• NEET questions are usually short — if the problem is long or ambiguous, it might be a JEE problem misrouted to the NEET batch. Flag this rather than guess.

2. Classify the topic

Name the NCERT chapter, not just the topic area. Examples: "Motion in a Plane (Ch 4, Class 11)", "Ray Optics and Optical Instruments (Ch 9, Class 12)", "Atoms (Ch 12, Class 12)". This helps the student learn the organizational map of their syllabus — and it's a natural sanity check for NEET, since problems should align with NCERT chapters.

If the problem is outside NCERT's scope for physics, note that explicitly — it's unusual for NEET.

3. Internet search for existing solutions

Search patterns:

• "[first 15 distinctive words]" NEET solution
• NEET [year if known] physics Q[number] answer
• NCERT [chapter name] [key concept] NEET question answer
• NEET physics [topic] [specific setup] option

Primary sources to weight:

• NEET official answer key (highest trust).
• Major coaching sites: Allen, Akash, Byju's, Vedantu, Toppr.
• Aggregators: Embibe, Doubtnut (often has solutions but can be behind sign-in).

Capture:

• The marked option letter (A/B/C/D).
• The method in one line.
• Agreement count across sites.

If nothing useful is found after 2 queries, note that and proceed to step 4.

4. Build your own solution

NEET solutions should be short. Aim for 2–3 substitutions, not a page of algebra.

a. Concept (one line): usually a direct NCERT formula. b. Key formula in symbolic form. c. Given quantities with SI units. d. Substitute and compute — NEET problems are almost always direct: find the right formula, plug in the right numbers, pick the option. e. SymPy verification: use scripts/verify.py for projectile, lens, RC, Bohr, de Broglie — these cover most NEET patterns. Keep Rational and exact constants until the final N().

For modern physics (a NEET favorite), use the shortcut E(eV) = 1240/λ(nm) for photon energies, E_n = −13.6 Z²/n² for Bohr levels, and T½ = ln2/λ_decay for half-life problems.

5. Cross-verify and iterate

• Agree (same option letter): done, proceed to step 6.
• Disagree: investigate. NEET's quirks to check first:
• Did you use g = 10 or 9.8? NEET usually wants 10.
• Is the unit in cm/m/km consistent across given values?
• For optics, did you use the correct sign convention (NCERT uses Cartesian).
• For modern physics, did you confuse λ in nm vs Å?
• Did you round too early and land between options?

Iteration cap: 3. If unresolved after 3 tries:

⚠️ My verified answer is [X]. Most online sources agree on [Y].
My best guess at the cause of the gap: [reason].
Recommend checking before sending.

Never overwrite a SymPy-verified answer to "fit" the internet. If the coaching key is wrong, the value of this skill is catching that — not papering over it.

6. Compose the WhatsApp-ready reply

NEET students read these during tight study windows. Keep it crisp.

*[Topic] — NEET*

*Concept:* [one line from NCERT]

*Key formula:* [equation in plain text]

*Given:* [quantities with units]

*Steps:*
1. [the single substitution or transformation]
2. [compute]

*Answer:* [value with units] → Option [A/B/C/D]

Notes:

• WhatsApp *bold* for headings only.
• No LaTeX.
• Aim for under 200 words. NEET explanations should be shorter than JEE — the problems are.
• Always end with the option letter, not just the number.

7. Stage for teacher approval

Default: stage, do not auto-send.

1. Show the draft.
2. Target batch: "NEET" — resolve via .auto-memory/project_whatsapp_mapping.md.
3. If there was a disagreement flag from step 5, highlight it at the top of the draft.
4. Say: "Draft ready for NEET batch. Say 'send it', 'edit: ...', or 'just for me'."
5. Call WhatsApp list_chats + send_message only on explicit confirm.

NEET-specific watchouts

These are the traps that most commonly cost the −1 in NEET:

• g = 10 is near-universal in NEET. Check if the problem deviates.
• Options are well-spaced (typical gap ~15–20%). If your answer is very close to two options, you almost certainly have a computation error — re-check.
• Unit traps: wavelength in nm vs Å (1 nm = 10 Å), current in mA vs A, magnetic field in mT vs T.
• Direct NCERT facts: NEET sometimes asks a "find the formula" question disguised as a problem. Recognize these — if you can answer in 5 seconds from memory, the "calculation" is a red herring.
• Optics sign conventions: Cartesian, NCERT's convention.
• Modern physics over-weighting: know the Bohr formula, photoelectric equation, de Broglie wavelength, and nuclear decay law cold.
• Semiconductor questions: often conceptual ("which diode is forward-biased?"), not calculational. Don't force algebra where recognition works.
• Dimensional analysis: faster than full derivation for ~10% of NEET physics questions. Use it when three constants are given and dimensions of the answer are specified.

Topic references

• references/mechanics.md
• references/electromagnetism.md
• references/modern_physics.md — weighted heaviest for NEET.
• references/common_pitfalls.md

Using the verification script

scripts/verify.py has helpers for most NEET patterns — projectile, pendulum, thin lens, RC charging, Bohr energies, de Broglie. Since NEET is MCQ-only, the usual check is to evaluate all four options against your computed value and pick the closest match (within the tolerance the question expects). For close-call options, carry 4–5 significant figures through the intermediate steps.