(a) Form. - In all trials the testimony of witnesses shall be taken orally in open court, unless otherwise provided by these rules.(b) Examination of hostile witnesses and adverse parties. - A party may interrogate any unwilling or hostile witness by leading questions and may contradict and impeach him in all respects as if he had been called by the adverse party. A party may call an adverse party or an agent or employee of an adverse party, or an officer, director, or employee of a public or private corporation or of a partnership or association which is an adverse party, or an officer, agent or employee of a state, county or municipal government or agency thereof which is an adverse party, and interrogate him by leading questions and contradict and impeach him in all respects as if he had been called by the adverse party.(c) Record of excluded evidence. - In an action tried before a jury, if an objection to a question propounded to a witness is sustained by the court, the court on request of the examining attorney shall order a record made of the answer the witness would have given. The court may add such other or further statement as clearly shows the character of the evidence, the form in which it was offered, the objection made and the ruling thereon. In actions tried without a jury the same procedure may be followed, except that the court upon request shall take and report the evidence in full, unless it clearly appears that the evidence is not admissible on any grounds or that the witness is privileged.(d) Affirmation in lieu of oath. - Whenever under these rules an oath is required to be taken, a solemn affirmation may be accepted in lieu thereof.(e) Evidence on motions. - When a motion is based on facts not appearing of record the court may hear the matter on affidavits presented by the respective parties, but the court may direct that the matter be heard wholly or partly on oral testimony or depositions.